Gr 9 NATURAL SCIENCES: Term Test 3

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What type of force occurs when an object is being squashed or deformed by forces acting towards each other?

Tension

Friction

Normal Force

Compression (correct)

What is the primary factor affecting the gravitational force between two objects?

Color of the objects

Mass of the objects (correct)

Shape of the objects

Distance between the objects

What is the direction of the gravitational force between two objects?

Perpendicular

Parallel

Repulsive

Attractive (correct)

What is the primary characteristic of magnetic forces?

They act over a distance Signup and view all the answers

What determines the direction of a magnetic field?

The poles of the magnet Signup and view all the answers

What is responsible for the electrostatic force between two objects?

Transfer of electrons Signup and view all the answers

What is the result of friction between two objects in terms of electrostatic forces?

One object becomes positively charged, the other negatively charged Signup and view all the answers

What type of force is responsible for the attraction between the Earth and objects on its surface?

Gravitational force Signup and view all the answers

What is the formula for calculating the weight of an object on Earth?

W = m × g Signup and view all the answers

What is the term for forces that act between objects without physical contact?

Non-contact forces Signup and view all the answers

What is the definition of a force?

A force is a push or pull on an object Signup and view all the answers

What is the unit of measurement for force?

Newton Signup and view all the answers

What is the effect of forces on an object's motion?

Start or stop the motion, increase or decrease its speed, or change its direction Signup and view all the answers

What is acceleration?

The rate at which an object's velocity changes over time Signup and view all the answers

What happens when one object exerts a force on another object?

The second object exerts an equal and opposite force back Signup and view all the answers

What is the result of balanced forces?

The net force is zero Signup and view all the answers

What is the result of unbalanced forces?

The net force is greater than zero, causing motion Signup and view all the answers

What is an example of action and reaction forces?

You pushing against a wall Signup and view all the answers

What is the purpose of the salt bridge in the zinc-copper cell?

To connect the two half-cells Signup and view all the answers

What happens to the zinc metal at the anode?

It loses electrons and becomes zinc ions Signup and view all the answers

What is the definition of electric current?

The rate of flow of electric charge in a circuit Signup and view all the answers

What is the unit of measurement for resistance?

Ohms Signup and view all the answers

What is the purpose of an ammeter or voltmeter in the zinc-copper cell?

To observe the ammeter or voltmeter reading Signup and view all the answers

What happens to the copper ions at the cathode?

They gain electrons and become copper metal Signup and view all the answers

What is the relationship between current, voltage, and resistance described by?

Ohm's Law Signup and view all the answers

What is a conductor?

A material that allows electric charge to flow through it easily Signup and view all the answers

What is the flow of electrons in an electrical conductor due to?

Delocalised electrons Signup and view all the answers

Why does resistance occur in an electrical circuit?

Due to the opposition to the flow of electrons Signup and view all the answers

What is the main difference between gravitational force and electrostatic force?

Gravitational force is always attractive, while electrostatic force can be attractive or repulsive. Signup and view all the answers

What is common to all three field forces?

They are all non-contact forces that can be represented by fields and field lines. Signup and view all the answers

What is the purpose of a salt bridge in a voltaic cell?

To connect the oxidation and reduction half-cells of the voltaic cell. Signup and view all the answers

What is the role of an electrolyte in an electric cell?

To produce an electrically conducting solution when dissolved. Signup and view all the answers

What is the primary function of an electric cell?

To convert chemical energy into electrical energy. Signup and view all the answers

What is the difference between an electric cell and a battery?

An electric cell is a single device, while a battery is a group of devices. Signup and view all the answers

What is the purpose of the zinc nail in the simple lemon battery experiment?

To act as one of the electrodes in the electrochemical reaction. Signup and view all the answers

What is the role of the lemon juice in the simple lemon battery experiment?

To act as the electrolyte in the electrochemical reaction. Signup and view all the answers

What is the main difference between an electric cell and a mechanical generator?

An electric cell relies on chemical reactions, while a mechanical generator relies on mechanical energy. Signup and view all the answers

What is the main purpose of a resistor in an electrical circuit?

To convert electrical energy into other forms Signup and view all the answers

What happens when electrons collide with the atoms of a conductor?

They transfer kinetic energy Signup and view all the answers

What is the symbol used to represent a resistor in a circuit diagram?

[[image of a resistor]] Signup and view all the answers

What is the purpose of a rheostat?

To control the current in a circuit Signup and view all the answers

What type of component is used to control the current flow through an LED?

A resistor Signup and view all the answers

What is the main difference between incandescent bulbs and LEDs?

Their efficiency Signup and view all the answers

What is the direction of current flow through a diode?

In one direction Signup and view all the answers

What is the term for the energy that is wasted as heat in a system?

Wasted energy Signup and view all the answers

What is the purpose of a resistor in a circuit with an LED?

To protect the LED from high currents Signup and view all the answers

What happens to the current in a circuit when the resistance is increased?

It decreases Signup and view all the answers

What is the main characteristic of a series circuit?

It has only one path for electric current Signup and view all the answers

What happens to the total voltage when cells are connected in series?

It increases Signup and view all the answers

What percentage of input energy is wasted as heat in an incandescent bulb?

90% Signup and view all the answers

How do you measure the potential difference in a circuit?

Using a voltmeter Signup and view all the answers

What is the purpose of an ammeter?

To measure the electric current Signup and view all the answers

What is the term that determines a material's ability to conduct electricity?

Resistivity Signup and view all the answers

How does the length of a conductor affect its resistance?

It increases the resistance Signup and view all the answers

What happens to the total resistance when resistors are connected in series?

It increases Signup and view all the answers

What is the main characteristic of a parallel circuit?

It provides multiple paths for electric current Signup and view all the answers

What is the effect of increasing the temperature of a conductor?

It increases the resistance Signup and view all the answers

How does the temperature affect the resistance of conductors?

It increases the resistance Signup and view all the answers

What is the formula to calculate the resistance of a conductor?

R = ρL/A Signup and view all the answers

Why is copper a better conductor than iron?

Copper has a lower resistivity Signup and view all the answers

What is the effect of longer conductors on resistance?

It increases the resistance Signup and view all the answers

How do you connect a voltmeter to measure the potential difference?

In parallel with the component Signup and view all the answers

What is the effect of a thicker conductor on its resistance?

It decreases the resistance Signup and view all the answers

What happens to the resistance of a conductor when its cross-sectional area is increased?

It decreases Signup and view all the answers

What is the purpose of connecting cells in series?

To increase the total voltage Signup and view all the answers

Why does the filament in an incandescent bulb heat up?

Due to the high resistance of the filament Signup and view all the answers

What are the four primary factors that affect the resistance of a conductor?

Type of material, length, cross-sectional area, and temperature Signup and view all the answers

What happens to the total resistance when resistors are added in parallel?

It decreases Signup and view all the answers

What is the advantage of connecting cells in parallel?

Stable voltage and increased battery life Signup and view all the answers

What is the relationship between the total current and the currents in each branch in a parallel circuit?

I_total = I_1 + I_2 + I_3 Signup and view all the answers

What is the purpose of using parallel circuits in homes?

To allow multiple devices to operate independently Signup and view all the answers

What happens to the potential difference across each branch in a parallel circuit?

It remains the same as the potential difference across the battery Signup and view all the answers

What is the effect of adding more devices in parallel circuits?

It has no effect on the overall resistance Signup and view all the answers

Why do parallel circuits provide a practical way to manage electricity in homes?

They allow multiple devices to operate independently Signup and view all the answers

What is the risk of overloading parallel circuits?

It can cause a fire or electrical shock Signup and view all the answers

What does the direction of an arrow represent when forces are represented using arrows?

Direction of the force Signup and view all the answers

Which law is used to measure forces using a spring balance?

Hooke's Law Signup and view all the answers

What type of force is friction an example of?

Contact force Signup and view all the answers

What is the normal force equal to on a flat, level surface?

Equal to the weight of the object but in the opposite direction Signup and view all the answers

What is the net force if a force of 7 N and 10 N are applied to an object, and friction is 5 N?

12 N Signup and view all the answers

What is an advantage of friction in movement?

It allows us to walk without slipping Signup and view all the answers

What type of force is the force of gravity between two objects an example of?

Non-contact force Signup and view all the answers

What is the force that opposes motion between two surfaces in contact?

Friction Signup and view all the answers

What is the force that occurs when an object is being pulled by forces acting from opposite ends?

Tension Signup and view all the answers

What is an example of a non-contact force that can exert a force on each other without touching?

Magnets Signup and view all the answers

What is the effect of forces on an object's motion?

It can change the object's speed, direction, or both Signup and view all the answers

When do action and reaction forces occur?

When one object exerts a force on another object Signup and view all the answers

What is the net force when multiple forces act on an object?

The combined effect of all the forces Signup and view all the answers

What is the result of unbalanced forces?

The object will change its motion Signup and view all the answers

What is the definition of acceleration?

The rate of change of an object's velocity Signup and view all the answers

What is the unit of measurement for force?

Newton Signup and view all the answers

What is an example of a force that can change an object's shape?

Pushing or pulling Signup and view all the answers

What happens when the forces acting on an object are balanced?

The object will remain stationary Signup and view all the answers

What is the main difference between tension and compression forces?

Tension forces stretch an object, while compression forces squash an object. Signup and view all the answers

What is the force of attraction between any two objects with mass?

Gravitational force Signup and view all the answers

What is the formula for calculating the weight of an object on Earth?

W = m × g Signup and view all the answers

What is the term for forces that act between objects without physical contact?

Field forces Signup and view all the answers

What is the nature of magnetic forces?

Like poles repel, and opposite poles attract Signup and view all the answers

What is the nature of electrostatic forces?

Like charges repel, and opposite charges attract Signup and view all the answers

What is the force that acts between charged objects?

Electrostatic force Signup and view all the answers

What is the result of friction between two objects in terms of electrostatic forces?

Electrons are transferred from one object to another Signup and view all the answers

What is the primary characteristic of field forces?

They act over a distance Signup and view all the answers

What is common to all three field forces?

They act over a distance Signup and view all the answers

What is the purpose of a spring balance in measuring force?

To stretch in proportion to the force applied Signup and view all the answers

What type of force occurs when objects are not in physical contact with each other?

Non-contact force Signup and view all the answers

What is the direction of the frictional force when an object is moving?

Opposite to the object's motion Signup and view all the answers

What is the normal force exerted by a surface on an object?

A force that prevents the object from penetrating the surface Signup and view all the answers

What is the result of friction between two surfaces in contact?

A decrease in the object's motion Signup and view all the answers

What is an example of a contact force?

Frictional force Signup and view all the answers

What is the relationship between friction and the normal force?

Friction is directly proportional to the normal force Signup and view all the answers

What is the advantage of friction in vehicle safety?

It prevents skidding Signup and view all the answers

What is the direction of the net force when an object is moving in a particular direction?

In the same direction as the object's motion Signup and view all the answers

What is the purpose of representing forces using arrows?

To indicate the direction and magnitude of the force Signup and view all the answers

What is a common characteristic of all three field forces?

They act over a distance without physical contact Signup and view all the answers

What is the primary function of an electrolyte in an electric cell?

To produce an electrically conducting solution Signup and view all the answers

What is the main difference between an electric cell and a mechanical generator?

The presence of moving parts Signup and view all the answers

What is the role of the copper nail in the simple lemon battery experiment?

To act as an electrode Signup and view all the answers

What is the purpose of a voltaic cell?

To convert chemical energy into electrical energy Signup and view all the answers

What is the direction of the electrostatic force between two objects with opposite charges?

Attractive Signup and view all the answers

What is the role of the lemon juice in the simple lemon battery experiment?

To act as an electrolyte Signup and view all the answers

What is the primary difference between a battery and an electric cell?

A battery is a group of two or more electric cells connected together Signup and view all the answers

What is the purpose of a salt bridge in a voltaic cell?

To connect the oxidation and reduction half-cells Signup and view all the answers

What is the primary characteristic of magnetic forces?

They can be attractive or repulsive Signup and view all the answers

Which of the following lighting systems has the highest efficiency of energy transfer?

LED Signup and view all the answers

What is the primary factor that affects the resistance of a conductor?

All of the above Signup and view all the answers

What happens to the resistance of a conductor when its length is increased?

It increases Signup and view all the answers

What is the term for the energy that is wasted as heat in a system?

Wasted Energy Signup and view all the answers

What is the effect of increasing the temperature of a conductor on its resistance?

It increases Signup and view all the answers

What is the formula that relates resistance, resistivity, length, and cross-sectional area of a conductor?

R = ρL/A Signup and view all the answers

What is the advantage of using thicker conductors?

They have lower resistance Signup and view all the answers

What happens to the resistance of an incandescent bulb as it heats up?

It increases Signup and view all the answers

What is the primary purpose of using a Sankey diagram?

To compare the efficiency of different lighting systems Signup and view all the answers

What is the relationship between the length of a conductor and its resistance?

They are directly proportional Signup and view all the answers

What is the primary function of a resistor in an electrical circuit?

To control the current in the circuit Signup and view all the answers

What happens when electrons collide with the atoms of a conductor?

Energy is transferred from the electrons to the atoms Signup and view all the answers

What is the primary difference between a rheostat and a fixed resistor?

A rheostat has variable resistance, while a fixed resistor has fixed resistance Signup and view all the answers

Why are LEDs more efficient than incandescent bulbs?

LEDs convert a higher percentage of electrical energy into light Signup and view all the answers

What is the purpose of a resistor in a circuit with an LED?

To control the current flow through the LED Signup and view all the answers

What happens to the current in a circuit when the resistance is increased?

The current decreases Signup and view all the answers

What is the term for the energy that is wasted as heat in a system?

Wasted energy Signup and view all the answers

What is the direction of current flow through a diode?

In one direction only Signup and view all the answers

What is the primary function of the U-tube filled with salt solution in the zinc-copper cell?

To allow the flow of ions between the two solutions Signup and view all the answers

What is the primary purpose of using resistors in electrical circuits?

To control the current in the circuit Signup and view all the answers

What happens to the zinc metal at the anode in the zinc-copper cell?

It loses electrons and goes into the solution as zinc ions Signup and view all the answers

What is the relationship between electric current, voltage, and resistance described by?

Ohm's Law Signup and view all the answers

What is the purpose of an ammeter or voltmeter in the zinc-copper cell?

To measure the electric current or voltage Signup and view all the answers

What happens to the copper ions at the cathode in the zinc-copper cell?

They gain electrons and become copper metal Signup and view all the answers

What is the term for the flow of electrons in an electrical conductor?

Electric current Signup and view all the answers

What is the purpose of a resistor in an electrical circuit?

To add resistance to the circuit Signup and view all the answers

What is the effect of increasing the resistance in an electrical circuit?

The current decreases Signup and view all the answers

What is the term for a material that allows electric charge to flow through it easily?

Conductor Signup and view all the answers

What is the result of the flow of electrons in an electrical conductor?

Electric current is generated Signup and view all the answers

What is the advantage of connecting cells in parallel?

Increased battery life and stable voltage Signup and view all the answers

What happens to the total resistance when resistors are added in parallel?

It decreases Signup and view all the answers

What is the purpose of parallel circuits in homes?

To allow multiple devices to operate independently Signup and view all the answers

What is the formula for calculating the total current in a parallel circuit?

I_total = I1 + I2 + I3 Signup and view all the answers

What is the potential difference across each branch in a parallel circuit?

The same as the potential difference across the battery Signup and view all the answers

What happens when the current divides in a parallel circuit?

It is additive Signup and view all the answers

What is the risk of overloading parallel circuits?

Fire or damage to the circuit Signup and view all the answers

What is the analogy used to describe the flow of current in a parallel circuit?

A school hall with multiple exit doors Signup and view all the answers

What happens to the total voltage when cells are connected in series?

It increases by the sum of the individual cell voltages Signup and view all the answers

What is the purpose of a voltmeter in a circuit?

To measure the potential difference between two points Signup and view all the answers

What is the characteristic of a series circuit?

It provides a single path for electric current Signup and view all the answers

What is the result of connecting resistors in series?

The total resistance increases Signup and view all the answers

What is the purpose of an ammeter in a circuit?

To measure the total current flowing through Signup and view all the answers

What is the characteristic of a parallel circuit?

It provides multiple paths for electric current Signup and view all the answers

What happens to the current through each component in a series circuit?

It remains the same Signup and view all the answers

What is the property of an ammeter?

It has a very small resistance Signup and view all the answers

What is the result of connecting cells in series?

The total voltage increases Signup and view all the answers

What is the purpose of measuring the potential difference across each component in a series circuit?

To determine the voltage across each component Signup and view all the answers

What is the primary characteristic that distinguishes electrostatic force from gravitational force?

Ability to be attractive or repulsive Signup and view all the answers

What is the primary difference between compression and tension forces?

One occurs when an object is squashed, while the other occurs when an object is stretched. Signup and view all the answers

What is the role of the electrolyte in an electric cell?

To produce an electrically conducting solution Signup and view all the answers

Which of the following is a common characteristic of both gravitational and magnetic forces?

They both act over a distance. Signup and view all the answers

What is the purpose of the copper nail in the simple lemon battery experiment?

To act as an electrode Signup and view all the answers

What is the primary difference between an electric cell and a mechanical generator?

Type of energy conversion Signup and view all the answers

What is the primary difference between the gravitational force and the electrostatic force?

One is always attractive, while the other can be either attractive or repulsive. Signup and view all the answers

What is the term used to describe the flow of electrons in an electrical conductor due to an electric potential difference?

Electric current Signup and view all the answers

What is the role of the mass of objects in determining the gravitational force between them?

The mass of the objects affects the magnitude of the force. Signup and view all the answers

What is the primary function of an electric cell?

To convert chemical energy into electrical energy Signup and view all the answers

What is the term for the force that arises from the transfer of electrons between objects?

Electrostatic force Signup and view all the answers

What is the purpose of the salt bridge in a voltaic cell?

To connect the oxidation and reduction half-cells Signup and view all the answers

What is the primary difference between a bridge experiencing compression and a tennis ball experiencing compression?

One is a result of weight, while the other is a result of external pressure. Signup and view all the answers

What is the primary characteristic that distinguishes magnetic force from gravitational force?

Ability to be attractive or repulsive Signup and view all the answers

What is the term for the forces that act between objects without physical contact?

Non-contact forces Signup and view all the answers

What is the primary characteristic of magnetic fields?

Like poles repel, and opposite poles attract. Signup and view all the answers

What is the primary similarity between gravitational force, magnetic force, and electrostatic force?

Non-contact nature Signup and view all the answers

What is the term used to describe a device that generates electricity from chemical reactions?

Electric cell Signup and view all the answers

What is the formula for calculating the weight of an object on Earth?

W = m × g Signup and view all the answers

What is the primary difference between the pillars of a bridge and the cables of a bridge?

One experiences compression, while the other experiences tension. Signup and view all the answers

What is the primary advantage of connecting cells in parallel?

Increased battery life and stable voltage Signup and view all the answers

What happens to the total resistance when resistors are added in parallel?

It decreases Signup and view all the answers

What is the purpose of parallel circuits in homes?

To allow multiple devices to operate independently Signup and view all the answers

What is the primary function of a resistor in an electrical circuit?

To control the current flowing through the circuit Signup and view all the answers

What happens to the current when it enters separate branches in a parallel circuit?

It divides Signup and view all the answers

What is the relationship between the potential difference across each branch and the potential difference across the battery in a parallel circuit?

The potential difference across each branch is the same as the potential difference across the battery Signup and view all the answers

What is the primary factor that affects the efficiency of energy transfer in an LED lighting system?

Type of material Signup and view all the answers

What happens when electrons collide with the atoms of a conductor?

The conductor becomes warmer due to the transfer of kinetic energy Signup and view all the answers

What is the result of overloading a parallel circuit?

The total resistance increases Signup and view all the answers

What is the primary characteristic of a rheostat?

It is a variable resistor used to control current Signup and view all the answers

What is the net force on an object when multiple forces act on it, but they cancel each other out?

A force of zero Signup and view all the answers

What is the relationship between the cross-sectional area of a conductor and its resistance?

An increase in cross-sectional area results in a decrease in resistance Signup and view all the answers

What is the main difference between incandescent bulbs and LEDs?

LEDs are more efficient and produce less heat Signup and view all the answers

What happens to the velocity of an object when a force is applied to it, causing it to accelerate?

The velocity changes, and the direction also changes Signup and view all the answers

What is the effect of increasing the temperature of a conductor on its resistance?

The resistance increases as the temperature increases Signup and view all the answers

Why does adding more devices in parallel not increase the overall resistance?

Because the devices are connected in parallel Signup and view all the answers

What is the purpose of a resistor in a circuit with an LED?

To protect the LED from high currents Signup and view all the answers

What is the purpose of the coiled tungsten wire in an incandescent bulb?

To provide high resistance and heat up the filament Signup and view all the answers

Which of the following is an example of a force that can cause a change in shape?

Pushing or pulling Signup and view all the answers

What is the analogy used to describe the flow of current in a parallel circuit?

Students exiting a school hall Signup and view all the answers

What is the result of Newton's Third Law of Motion?

An equal and opposite force is exerted by the second object Signup and view all the answers

What happens to the current in a circuit when the resistance is increased?

The current decreases Signup and view all the answers

What is the term for the flow of electrons in an electrical conductor due to a potential difference?

Electric current Signup and view all the answers

What is the unit of measurement for resistivity?

Ohms per meter (Ω/m) Signup and view all the answers

What is the direction of the force exerted by the wall on you when you push against it?

In the opposite direction of your push Signup and view all the answers

What is the primary function of a diode?

To allow current to flow in only one direction Signup and view all the answers

What is the effect of increasing the length of a conductor on its resistance?

The resistance increases as the length increases Signup and view all the answers

What is the term for the rate at which an object's velocity changes over time?

Acceleration Signup and view all the answers

What is the formula for calculating the resistance of a conductor?

R = ρL/A Signup and view all the answers

What is the term for the energy wasted as heat in a system?

Wasted energy Signup and view all the answers

What is the result of unbalanced forces acting on an object?

The object will accelerate in the direction of the net force Signup and view all the answers

What is the main difference between an incandescent bulb and an LED?

The efficiency of energy transfer Signup and view all the answers

What is the unit of measurement for force?

Newton Signup and view all the answers

What happens to the light emitted by an LED when the resistance in the circuit is increased?

The light becomes dimmer Signup and view all the answers

What is the term for the energy that is wasted as heat in a system?

Thermal energy Signup and view all the answers

What is the primary function of the copper plate in the zinc-copper cell?

To allow the flow of electrons from the zinc plate Signup and view all the answers

What is the result of the chemical reaction occurring at the zinc electrode in the zinc-copper cell?

Zinc metal loses electrons Signup and view all the answers

What is the purpose of the U-tube filled with salt solution in the zinc-copper cell?

To allow the flow of ions between the two solutions Signup and view all the answers

What is the definition of a resistor in electrical circuits?

An electrical component that adds resistance to a circuit Signup and view all the answers

What is the relationship between current, voltage, and resistance described by?

Ohm's Law Signup and view all the answers

What is the result of the movement of electrons in a conductor?

Electric current flows in the same direction Signup and view all the answers

What is the primary characteristic of a conductor?

It has low resistance Signup and view all the answers

What is the purpose of the ammeter or voltmeter in the zinc-copper cell?

To measure the current of the cell Signup and view all the answers

What is the flow of electrons in an electrical conductor due to?

The energy source, such as a battery Signup and view all the answers

Why does resistance occur in an electrical circuit?

Because of the collisions between electrons and the atoms of the conductor Signup and view all the answers

What happens to the total resistance when resistors are added in series?

It increases Signup and view all the answers

What is the purpose of a voltmeter in a circuit?

To measure the potential difference between two points in the circuit Signup and view all the answers

What is the characteristic of a parallel circuit?

It provides more than one path for electric current to move through the circuit Signup and view all the answers

What happens to the voltage across each resistor when cells are connected in series?

It divides equally Signup and view all the answers

What is the effect of temperature on the resistance of conductors?

It increases the resistance Signup and view all the answers

What is the purpose of an ammeter in a circuit?

To measure the current flowing through the circuit Signup and view all the answers

What is the characteristic of a series circuit?

It provides only one path for electric current to move through the circuit Signup and view all the answers

What happens to the total current when resistors are added in series?

It decreases Signup and view all the answers

Why do resistors have a small resistance when used as an ammeter?

So they don't affect the current they are measuring Signup and view all the answers

What happens to the total voltage when cells are connected in parallel?

It remains the same Signup and view all the answers

What is the main purpose of a spring balance in measuring forces?

To measure the magnitude of a force Signup and view all the answers

Which of the following is an example of a non-contact force?

Gravitational force Signup and view all the answers

What is the direction of the frictional force when an object is moving?

In the opposite direction to the motion Signup and view all the answers

What is the normal force equal to on a flat, level surface?

The normal force equals the object's weight but in the opposite direction Signup and view all the answers

What is the relationship between friction and normal force?

Friction is proportional to the normal force Signup and view all the answers

What is the advantage of friction in vehicle safety?

It prevents skidding Signup and view all the answers

What type of force occurs when an object is being pulled by forces acting from opposite ends?

Tension force Signup and view all the answers

What is the net force calculated as in the example of pushing a go-cart?

The difference between the forces pushing it forward and friction Signup and view all the answers

What is the direction of the normal force on a flat, level surface?

Upward Signup and view all the answers

What is the advantage of friction in movement?

It allows us to walk without slipping Signup and view all the answers

What is the primary fuel used in a nuclear power station due to its ability to undergo fission?

Uranium Signup and view all the answers

What is the process of combining two light atomic nuclei to form a heavier nucleus, releasing energy?

Nuclear Fusion Signup and view all the answers

What is the primary purpose of control rods in a nuclear reactor?

To regulate the fission process Signup and view all the answers

What is the term for the energy produced from controlled nuclear reactions?

Nuclear Power Signup and view all the answers

What is the purpose of the cooling system in a nuclear power plant?

To ensure the reactor and other components remain at safe operating temperatures Signup and view all the answers

What is the advantage of nuclear power generation in terms of greenhouse gas emissions?

Minimal greenhouse gas emissions Signup and view all the answers

What is the purpose of radiation containment in a nuclear power plant?

To prevent radiation leakage Signup and view all the answers

What is the term for the process of splitting a heavy atomic nucleus into two smaller nuclei, releasing energy?

Nuclear Fission Signup and view all the answers

What is the location of the Koeberg Nuclear Power Station in South Africa?

Cape Town Signup and view all the answers

What is the primary difference between nuclear power and alternative energy sources?

Renewability Signup and view all the answers

What is the primary purpose of earthing in electrical appliances?

To prevent electric shocks by connecting the metal casing to the ground Signup and view all the answers

What happens when a live wire touches the metal casing of an electrical appliance with proper earthing?

The current will flow through the earth wire to the ground, preventing an electric shock Signup and view all the answers

What is the function of a fuse in an electrical circuit?

To melt and break the circuit when current exceeds a safe level Signup and view all the answers

What is the primary purpose of a short circuit?

To create an unintended low-resistance path, causing a surge in current Signup and view all the answers

What is the function of an earth leakage circuit breaker?

To detect any leakage of current to the earth wire and immediately shut off the power Signup and view all the answers

What is the primary advantage of nuclear power plants compared to some renewable energy sources?

They can operate continuously and are not dependent on weather conditions Signup and view all the answers

What is the typical location of an earth leakage circuit breaker?

On the electrical distribution board in homes Signup and view all the answers

What is the term for a network of interacting components that work together to provide electricity across a country?

National Electricity Grid Signup and view all the answers

What is the primary cause of overloading in parallel circuits?

Too many devices connected to the circuit Signup and view all the answers

What is the primary consequence of overloading in parallel circuits?

Excessive heat build-up, potentially leading to electrical fires Signup and view all the answers

What is the purpose of step-up transformers in the national electricity grid?

To increase the voltage of electricity for efficient transmission Signup and view all the answers

What is the effect of a power surge on sensitive electronic devices and circuits?

It can cause damage to them Signup and view all the answers

What is the term for a device that changes the voltage of an electric current?

Transformer Signup and view all the answers

What is the primary safety risk associated with nuclear power plants?

Accidents and radiation leaks Signup and view all the answers

What is the purpose of pylons in the national electricity grid?

To support transmission lines and keep them elevated and secure Signup and view all the answers

What happens to the voltage of electricity during transmission in the national electricity grid?

It is stepped up and then stepped down Signup and view all the answers

What is the purpose of grid monitoring in the national electricity grid?

To detect and prevent power surges and overloads Signup and view all the answers

What is the term for a sudden increase in voltage within an electrical circuit?

Power Surge Signup and view all the answers

What is the primary function of step-up transformers in a power grid?

To increase voltage and decrease current before transmission Signup and view all the answers

What is the unit of measurement for the energy consumed by an appliance?

Kilowatt-hour (kWh) Signup and view all the answers

What is the purpose of a tiered tariff system used by Eskom?

To charge consumers a higher rate for higher usage Signup and view all the answers

What is the formula for calculating energy consumption in joules?

Energy = Power × Time Signup and view all the answers

What is the purpose of step-down transformers in a power grid?

To decrease voltage and increase current before distribution Signup and view all the answers

What is the unit of measurement for power?

Watt Signup and view all the answers

What is the term for the price schedule or rate for services provided by Eskom?

Tariff Signup and view all the answers

What is the purpose of calculating energy consumption in kWh?

To find the cost of electricity consumption Signup and view all the answers

What is the primary method of generating electricity in power stations?

Converting different forms of energy into electrical energy Signup and view all the answers

What is the purpose of the turbine in a coal-powered power station?

To convert mechanical energy into electrical energy Signup and view all the answers

What is the primary reason behind illegal connections in areas where electricity is not accessible?

Lack of access to legal electricity connections Signup and view all the answers

What is the environmental disadvantage of relying on coal for electricity generation?

It contributes to environmental pollution, greenhouse gas emissions, and climate change Signup and view all the answers

What is the consequence of overloaded power grids due to illegal connections?

Frequent power outages and disruptions Signup and view all the answers

What is the process of generating electricity from hydroelectric power?

Using the potential energy of stored water to generate electricity Signup and view all the answers

What is the primary function of a lightning rod?

To channel lightning strikes away from buildings Signup and view all the answers

What is the advantage of using solar power for electricity generation?

It is abundant and renewable, and has no emissions during operation Signup and view all the answers

What is the result of exposed wires and poor-quality connections in illegal connections?

Sparks that can ignite nearby flammable materials Signup and view all the answers

What is the purpose of a generator in a power station?

To convert mechanical energy into electrical energy Signup and view all the answers

What is the advantage of using wind power for electricity generation?

It is renewable, has low operational costs, and has no emissions during operation Signup and view all the answers

What is the purpose of education campaigns to address illegal connections?

To educate people on the risks of illegal connections and the benefits of legal connections Signup and view all the answers

What is the consequence of individuals resorting to illegal connections to avoid paying for electricity?

Electricity theft, affecting the revenue of utility companies Signup and view all the answers

What is the process of generating electricity using a portable generator?

Burning fuel such as petrol or diesel to generate electricity Signup and view all the answers

What is the purpose of pulverization in a coal-powered power station?

To crush large chunks of coal into a fine powder Signup and view all the answers

What is the primary motivation behind some individuals profiting from illegal connections?

Financial gain Signup and view all the answers

What is the environmental advantage of using alternative energy sources such as hydroelectric power?

It is renewable, and has less pollution and emissions compared to coal Signup and view all the answers

What is the consequence of insecure and exposed electrical connections in illegal connections?

Severe risk of electrocution Signup and view all the answers

What is the purpose of strengthening regulations and enforcement against illegal connections?

To deter illegal connections and promote safe and legal electricity access Signup and view all the answers

What is the primary characteristic of illegal connections?

Direct connection to the national grid without proper authorization Signup and view all the answers

What is the primary purpose of the environmental levy in the tariff structure?

To generate revenue for the government Signup and view all the answers

What is the correct formula for calculating the cost of using an electrical appliance?

cost = power rating x time x price Signup and view all the answers

What is the unit of measurement for electrical power?

Watts (W) Signup and view all the answers

What is the purpose of conducting a household energy survey?

To identify areas for energy efficiency improvement Signup and view all the answers

What is the characteristic of energy-efficient appliances?

They consume less energy than traditional appliances Signup and view all the answers

What is the term for the rate at which electrical energy is supplied or consumed by a device?

Electrical power Signup and view all the answers

What is the correct formula for calculating electrical power?

power = energy / time Signup and view all the answers

What is the purpose of the label or stamp on an electrical appliance?

To provide the appliance's power rating Signup and view all the answers

What is the unit of measurement for energy consumption?

Kilowatt-hours (kWh) Signup and view all the answers

What is the result of using energy-efficient appliances?

Decreased energy consumption Signup and view all the answers

What is the primary motivation behind illegal electricity connections in certain areas?

Lack of access to legal electricity supply Signup and view all the answers

What is a common risk associated with illegal electricity connections?

Both A and B Signup and view all the answers

What is a likely consequence of illegal electricity connections on the power grid?

Frequent power outages and disruptions Signup and view all the answers

What is a potential solution to address illegal electricity connections?

Implementing programs to extend legal access to underserved areas Signup and view all the answers

What is the main reason why individuals might choose to use illegal electricity connections despite having legal access?

To avoid paying for electricity Signup and view all the answers

What is a common characteristic of illegal electricity connections?

Exposed wires and insecure connections Signup and view all the answers

What is a consequence of electricity theft on utility companies?

Reduced investment in infrastructure improvements Signup and view all the answers

What is a key aspect of discussing the risks of illegal electricity connections?

Examining the setup of an illegal connection Signup and view all the answers

What is a potential solution to address the safety hazards associated with illegal electricity connections?

Implementing education campaigns to raise awareness about the risks Signup and view all the answers

What is the primary purpose of earthing in electrical appliances?

To prevent electric shocks by connecting metal parts to the ground Signup and view all the answers

What happens when a live wire accidentally touches the metal casing of an appliance?

The current flows through the earth wire, creating a short circuit Signup and view all the answers

What is the purpose of strengthening regulations and enforcement against illegal connections?

To deter illegal connections and promote legal access Signup and view all the answers

What is the function of a fuse in an electrical circuit?

To melt and break the circuit when the current exceeds a safe level Signup and view all the answers

What is the primary fuel used in nuclear power stations?

Uranium Signup and view all the answers

What is a short circuit?

An unintended low-resistance path created in a circuit, causing a surge in current Signup and view all the answers

What is the process of splitting a heavy atomic nucleus into two smaller nuclei, releasing energy?

Nuclear Fission Signup and view all the answers

What is the purpose of an earth leakage circuit breaker?

To detect any leakage of current to the earth wire and immediately shut off the power Signup and view all the answers

What is the purpose of control rods in a nuclear reactor?

To regulate the fission process by absorbing excess neutrons Signup and view all the answers

Where are earth leakage circuit breakers typically located?

On the electrical distribution board in homes Signup and view all the answers

What is the main difference between a fuse and a circuit breaker?

A fuse breaks the circuit when the current exceeds a safe level, while a circuit breaker can be reset after a fault Signup and view all the answers

What is the advantage of nuclear power generation in terms of climate change?

Low greenhouse gas emissions Signup and view all the answers

Why is it important to manage the load on each circuit?

To prevent overheating and electrical fires Signup and view all the answers

What is the term for the energy produced from controlled nuclear reactions?

Nuclear Power Signup and view all the answers

What is the purpose of the cooling system in a nuclear power station?

To ensure the reactor and other components remain at safe operating temperatures Signup and view all the answers

What is the term for the process of combining two light atomic nuclei to form a heavier nucleus, releasing energy?

Nuclear Fusion Signup and view all the answers

What is the location of the Koeberg Nuclear Power Station?

Cape Town, South Africa Signup and view all the answers

What is the term for the emission of radiation as a result of the decay of atomic nuclei?

Radioactive Decay Signup and view all the answers

What is the purpose of radiation containment in a nuclear power station?

To prevent radiation leakage Signup and view all the answers

What is the primary method of generating electricity in South Africa?

Coal Signup and view all the answers

What is the purpose of the turbine in a coal-powered power station?

To push the blades of a generator Signup and view all the answers

What is a disadvantage of using coal as an energy source?

It contributes to environmental pollution Signup and view all the answers

What is the process of generating electricity in a hydroelectric power plant?

Using the potential energy of stored water to generate electricity Signup and view all the answers

What is an advantage of using wind power as an energy source?

It is renewable and has low operational costs Signup and view all the answers

What is the purpose of a generator in a power station?

To convert mechanical energy into electrical energy Signup and view all the answers

What is an alternative energy source used to generate electricity?

All of the above Signup and view all the answers

What is the purpose of a portable generator?

To generate electricity during power outages Signup and view all the answers

What is the result of the combustion process in a coal-powered power station?

The generation of heat Signup and view all the answers

What is the term for energy sources that are not derived from fossil fuels?

Alternative energy Signup and view all the answers

What is the primary function of step-up transformers in the electrical grid?

To increase voltage and decrease current before transmission Signup and view all the answers

What is the purpose of a tiered tariff system in electricity pricing?

To penalize high-energy consumers with higher rates Signup and view all the answers

What is the unit of measurement for energy consumption in household appliances?

Kilowatt-hours (kWh) Signup and view all the answers

What is the formula for calculating energy consumption in kWh?

Energy (kWh) = Power (W) x Time (h) Signup and view all the answers

What is the term for the amount of electrical energy used by an appliance or device?

Power Consumption Signup and view all the answers

What is the primary electricity supplier in South Africa?

Eskom Signup and view all the answers

What is the purpose of step-down transformers in the electrical grid?

To decrease voltage and increase current before distribution Signup and view all the answers

What is the unit of measurement for the total amount of visible light emitted by a source?

Lumens (lm) Signup and view all the answers

What is a major advantage of nuclear power plants over some renewable energy sources?

They can operate continuously and are not dependent on weather conditions Signup and view all the answers

What is a major concern with nuclear power?

The risk of accidents and radiation leaks Signup and view all the answers

What is the purpose of a transformer in the national electricity grid?

To change the voltage of an electric current Signup and view all the answers

What is the primary function of pylons in the national electricity grid?

To support overhead power lines Signup and view all the answers

What is the rate at which electrical energy is supplied or consumed by a device?

Electrical power Signup and view all the answers

What is the result of a power surge in the national electricity grid?

An increase in voltage Signup and view all the answers

What is the purpose of a surge protector in the national electricity grid?

To absorb excess voltage and prevent damage Signup and view all the answers

What is the formula to calculate the cost of operating an appliance?

cost = power rating x time x price Signup and view all the answers

What is the unit of measurement for power?

Watt (W) Signup and view all the answers

What is the main component of a coal-powered power station that generates electricity?

Generator Signup and view all the answers

What is the primary purpose of the step-up transformer in a power station?

To increase the voltage of an electric current Signup and view all the answers

What is the purpose of a household energy survey?

To understand the household's energy consumption Signup and view all the answers

What is the purpose of the national electricity grid?

To distribute electricity to homes and businesses Signup and view all the answers

What is the environmental levy for Block 2 energy consumption?

2.28 c/kWh Signup and view all the answers

What is the main function of the grid monitoring system?

To cut off the power supply during a power surge Signup and view all the answers

What is the energy charge for Block 3 energy consumption?

124.74 c/kWh Signup and view all the answers

What is the total cost of energy consumption for a household that uses 252 kWh in a month?

R207.59 Signup and view all the answers

What is the power rating of a 1500 W microwave?

1.5 kW Signup and view all the answers

What is the purpose of looking for a label or stamp on an appliance?

To determine the power rating Signup and view all the answers

What is the energy consumption block for a household that uses more than 600 kWh in a month?

Block 4 Signup and view all the answers

What is the primary purpose of a lightning rod?

To safely channel lightning strikes away from buildings Signup and view all the answers

What is a common motivation behind illegal electricity connections?

To avoid paying for electricity Signup and view all the answers

What is a risk associated with illegal electricity connections?

Fire risk and electrocution Signup and view all the answers

What is a consequence of illegal electricity connections?

Legal consequences, including fines and imprisonment Signup and view all the answers

What is the main purpose of earthing in electrical appliances?

To prevent electric shocks by connecting the metal casing to the ground Signup and view all the answers

What is a solution to address illegal electricity connections?

Implement programs to extend legal electricity access Signup and view all the answers

What occurs when a live wire touches the metal casing of an electrical appliance?

A short circuit is created, protecting the user from electric shock Signup and view all the answers

What is the function of a fuse in an electrical circuit?

To break the circuit when the current exceeds a safe level Signup and view all the answers

Why do some areas resort to illegal electricity connections?

Due to lack of access to electricity Signup and view all the answers

What can happen due to overloading from illegal connections?

Power outages and service disruptions Signup and view all the answers

What is the primary function of an earth leakage circuit breaker?

To detect and prevent leakage of current to the earth wire Signup and view all the answers

What is a risk of exposed wires and connections in illegal electricity connections?

Severe risk of electric shock and electrocution Signup and view all the answers

What happens when a short circuit occurs in an electrical circuit?

A surge in current causes damage to appliances and overheating Signup and view all the answers

What can education campaigns achieve in addressing illegal electricity connections?

Reduce the number of illegal connections Signup and view all the answers

What is the purpose of the neutral wire in an electrical circuit?

To carry current away from the appliance Signup and view all the answers

What is a result of electricity theft on utility companies?

Higher costs for legitimate consumers Signup and view all the answers

What is the primary cause of electrical fires in parallel circuits?

Overloading of the circuit Signup and view all the answers

What is the purpose of managing the load on each circuit?

To prevent overheating and electrical fires Signup and view all the answers

What is the primary fuel used in a nuclear power station?

Uranium Signup and view all the answers

What is the process of splitting a heavy atomic nucleus into two smaller nuclei, releasing energy?

Nuclear Fission Signup and view all the answers

What is the primary method of generating electricity in South Africa?

Coal Signup and view all the answers

What is the purpose of control rods in a nuclear reactor?

To regulate the fission process Signup and view all the answers

What is the role of a turbine in a coal-powered power station?

To convert mechanical energy into electrical energy Signup and view all the answers

What is the advantage of nuclear power generation compared to fossil fuels?

Lower greenhouse gas emissions Signup and view all the answers

What is the function of a generator in a power station?

To convert mechanical energy into electrical energy Signup and view all the answers

What is the process of combining two light atomic nuclei to form a heavier nucleus, releasing energy?

Nuclear Fusion Signup and view all the answers

What is the environmental impact of relying on coal for electricity generation?

It leads to habitat destruction and health issues Signup and view all the answers

What is the process of generating electricity from falling water?

Hydroelectric power Signup and view all the answers

What is the term for the energy produced from controlled nuclear reactions?

Nuclear Power Signup and view all the answers

What is the location of the Koeberg Power Station in South Africa?

Cape Town Signup and view all the answers

What is the advantage of using wind power for electricity generation?

It is a renewable energy source with low operational costs Signup and view all the answers

What is the process of generating electricity from sunlight?

Photovoltaic cells Signup and view all the answers

What is the purpose of the cooling system in a nuclear power station?

To ensure the reactor and other components remain at safe operating temperatures Signup and view all the answers

What is the purpose of a portable generator?

To provide power during grid outages Signup and view all the answers

What is the result of radioactive decay?

The unstable nucleus transforms into a different element Signup and view all the answers

What is an alternative energy source that uses heat from the Earth's interior to generate electricity?

Geothermal energy Signup and view all the answers

What is the term for emitting radiation as a result of the decay of atomic nuclei?

Radioactive Signup and view all the answers

What is the primary characteristic of a power station?

It is a facility for the generation of electrical power Signup and view all the answers

What is the primary function of Step-Up Transformers in the grid?

To increase voltage and decrease current before transmission Signup and view all the answers

What is the unit of energy consumption commonly used for monthly energy bills?

Kilowatt-hours (kWh) Signup and view all the answers

What is the purpose of Eskom's tiered tariff system?

To charge higher rates for higher usage levels Signup and view all the answers

What is the formula to calculate energy consumption?

energy = power × time Signup and view all the answers

What is the primary electricity supplier in South Africa?

Eskom Signup and view all the answers

What is the purpose of a Step-Down Transformer?

To decrease voltage and increase current before distribution to homes and businesses Signup and view all the answers

What is the unit of measurement for power?

Watts (W) Signup and view all the answers

What is the purpose of calculating energy consumption?

To determine the cost of electrical power Signup and view all the answers

What is the unit of power equal to one joule of energy per second?

Watt (W) Signup and view all the answers

What is the rate at which electrical energy is supplied or consumed by a device?

Electrical Power Signup and view all the answers

What is the formula to calculate the cost of operating an appliance?

cost = power rating × time × price Signup and view all the answers

What is the purpose of conducting a household energy survey?

To understand the household's energy consumption pattern Signup and view all the answers

What is the term for forces that act between objects without physical contact?

Non-Contact Forces Signup and view all the answers

What is the block tariff structure used for?

To calculate the cost of energy consumption Signup and view all the answers

What is the unit of measurement for energy?

Joule (J) Signup and view all the answers

What does the power rating of an appliance indicate?

The rate at which the appliance consumes energy Signup and view all the answers

What is the purpose of looking for a label or stamp on an appliance?

To identify the power rating of the appliance Signup and view all the answers

What is the term for the rate at which energy is being used?

Electrical Power Signup and view all the answers

What is a major advantage of nuclear power plants?

They can operate continuously. Signup and view all the answers

What is a major disadvantage of nuclear power plants?

They have high initial costs. Signup and view all the answers

What is the main purpose of a transformer in the national electricity grid?

To change the voltage of an electric current. Signup and view all the answers

What is the purpose of pylons in the national electricity grid?

To support overhead power lines. Signup and view all the answers

What is a power surge?

A sudden increase in voltage. Signup and view all the answers

What is the purpose of a surge protector?

To safeguard appliances from power surges. Signup and view all the answers

What is the main purpose of the national electricity grid?

To ensure the delivery of electricity from power stations to consumers. Signup and view all the answers

What is the purpose of step-up transformers in the national electricity grid?

To increase the voltage of an electric current. Signup and view all the answers

What happens to the voltage of an electric current when it is transmitted over long distances?

It decreases. Signup and view all the answers

What is the purpose of the diagram of a coal-powered power station connected to the grid?

To describe how electricity is generated from coal and transmitted to the grid. Signup and view all the answers

Gr 9 NATURAL SCIENCES: Term Test 3

Podcast Beta

Questions and Answers

What type of force occurs when an object is being squashed or deformed by forces acting towards each other?

What is the primary factor affecting the gravitational force between two objects?

What is the direction of the gravitational force between two objects?

What is the primary characteristic of magnetic forces?

What determines the direction of a magnetic field?

What is responsible for the electrostatic force between two objects?

What is the result of friction between two objects in terms of electrostatic forces?

What type of force is responsible for the attraction between the Earth and objects on its surface?

What is the formula for calculating the weight of an object on Earth?

What is the term for forces that act between objects without physical contact?

What is the definition of a force?

What is the unit of measurement for force?

What is the effect of forces on an object's motion?

What is acceleration?

What happens when one object exerts a force on another object?

What is the result of balanced forces?

What is the result of unbalanced forces?

What is an example of action and reaction forces?

What is the purpose of the salt bridge in the zinc-copper cell?

What happens to the zinc metal at the anode?

What is the definition of electric current?

What is the unit of measurement for resistance?

What is the purpose of an ammeter or voltmeter in the zinc-copper cell?

What happens to the copper ions at the cathode?

What is the relationship between current, voltage, and resistance described by?

What is a conductor?

What is the flow of electrons in an electrical conductor due to?

Why does resistance occur in an electrical circuit?

What is the main difference between gravitational force and electrostatic force?

What is common to all three field forces?

What is the purpose of a salt bridge in a voltaic cell?

What is the role of an electrolyte in an electric cell?

What is the primary function of an electric cell?

What is the difference between an electric cell and a battery?

What is the purpose of the zinc nail in the simple lemon battery experiment?

What is the role of the lemon juice in the simple lemon battery experiment?

What is the main difference between an electric cell and a mechanical generator?

What is the main purpose of a resistor in an electrical circuit?

What happens when electrons collide with the atoms of a conductor?

What is the symbol used to represent a resistor in a circuit diagram?

What is the purpose of a rheostat?

What type of component is used to control the current flow through an LED?

What is the main difference between incandescent bulbs and LEDs?

What is the direction of current flow through a diode?

What is the term for the energy that is wasted as heat in a system?

What is the purpose of a resistor in a circuit with an LED?

What happens to the current in a circuit when the resistance is increased?

What is the main characteristic of a series circuit?

What happens to the total voltage when cells are connected in series?

What percentage of input energy is wasted as heat in an incandescent bulb?

How do you measure the potential difference in a circuit?

What is the purpose of an ammeter?

What is the term that determines a material's ability to conduct electricity?

How does the length of a conductor affect its resistance?

What happens to the total resistance when resistors are connected in series?

What is the main characteristic of a parallel circuit?

What is the effect of increasing the temperature of a conductor?

How does the temperature affect the resistance of conductors?

What is the formula to calculate the resistance of a conductor?

Why is copper a better conductor than iron?

What is the effect of longer conductors on resistance?

How do you connect a voltmeter to measure the potential difference?

What is the effect of a thicker conductor on its resistance?

What happens to the resistance of a conductor when its cross-sectional area is increased?

What is the purpose of connecting cells in series?

Why does the filament in an incandescent bulb heat up?

What are the four primary factors that affect the resistance of a conductor?

What happens to the total resistance when resistors are added in parallel?

What is the advantage of connecting cells in parallel?

What is the relationship between the total current and the currents in each branch in a parallel circuit?

What is the purpose of using parallel circuits in homes?

What happens to the potential difference across each branch in a parallel circuit?

What is the effect of adding more devices in parallel circuits?

Why do parallel circuits provide a practical way to manage electricity in homes?

What is the risk of overloading parallel circuits?

What does the direction of an arrow represent when forces are represented using arrows?

Which law is used to measure forces using a spring balance?