Gr 9 NATURAL SCIENCES: CH 3.3 SUM Resistance

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What is the definition of resistance?

The flow of electrons in a conductor

The rate of flow of electric charge in a circuit

A measure of how much a material opposes the flow of electric current (correct)

A property of matter that causes it to experience a force in an electric field

What represents a low resistance environment in the break time scenario?

The classroom doorway

The narrow corridor

The open field (correct)

The school building

What is an electrical component that adds resistance to a circuit?

A conductor

A delocalised electron

A resistor (correct)

An electric current

What is the term for electrons that are not associated with a particular atom and can move freely?

Delocalised Signup and view all the answers

What is the unit of measurement for resistance?

Ohms Signup and view all the answers

What causes electrons to move towards the positive terminal, creating an electric current?

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

What is the term for a material that allows the flow of electric charge?

Conductor Signup and view all the answers

What opposes the flow of electrons in a circuit?

Resistance Signup and view all the answers

What is the rate at which electric charge flows through a conductor in a closed circuit?

Electric current Signup and view all the answers

What is the property of matter that causes it to experience a force in an electric field?

Electric charge Signup and view all the answers

What percentage of electrical energy is converted into light in an incandescent bulb?

10% Signup and view all the answers

What percentage of electrical energy is wasted as heat in an LED?

20% Signup and view all the answers

Which of the following factors affects the resistance of a conductor?

Type of material 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 term for the ability of a material to conduct electricity?

Resistivity Signup and view all the answers

What is the purpose of resistors in electrical circuits?

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

What happens to the resistance of a conductor when its thickness increases?

It decreases Signup and view all the answers

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

The material heats up Signup and view all the answers

What is the function of a rheostat in a circuit?

To control the current Signup and view all the answers

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

It increases Signup and view all the answers

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

To control the current flow Signup and view all the answers

What happens to the resistance of a conductor when its temperature increases?

It increases Signup and view all the answers

What is a characteristic of a diode?

It has low resistance to current flow in one direction Signup and view all the answers

Why does the filament in an incandescent bulb heat up and emit light?

Due to its high resistance Signup and view all the answers

Why are LEDs more efficient than incandescent light bulbs?

They produce more light with less electrical input energy Signup and view all the answers

What is the purpose of coiling the filament in an incandescent bulb?

To fit it into a small space Signup and view all the answers

How many primary factors affect the resistance of a conductor?

4 Signup and view all the answers

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

Signup and view all the answers

What is the result of increasing the resistance in a circuit?

The current decreases Signup and view all the answers

What is the purpose of resistors in controlling the brightness of a light bulb?

To control the current flow 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 purpose of using a resistor in a circuit with an LED?

To control the current Signup and view all the answers

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

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

What is the function of a rheostat in a circuit?

To control the current Signup and view all the answers

Why are LEDs more efficient than incandescent light bulbs?

LEDs produce more light with less electrical energy Signup and view all the answers

What is the result of collisions between electrons and the atoms of a conductor?

The material heats up Signup and view all the answers

What is the main reason why movement becomes restricted in the corridor and classroom doorway during school break time?

The corridor and doorway are narrower Signup and view all the answers

What is the result of connecting an energy source to a conductor?

The electrons move towards the positive terminal Signup and view all the answers

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

To allow the flow of electric charge Signup and view all the answers

What is the effect of resistance on the flow of electrons in a circuit?

It decreases the flow of electrons Signup and view all the answers

What is the significance of delocalised electrons in metals?

They are not associated with a particular atom and can move freely Signup and view all the answers

What is the relationship between the flow of electrons and the electric current in a conductor?

The flow of electrons is the same as the electric current Signup and view all the answers

What is the main difference between incandescent bulbs and LEDs?

LEDs convert a higher percentage of electrical energy into light with minimal energy wasted as heat Signup and view all the answers

What is the effect of increasing the cross-sectional area of a conductor?

The resistance of the conductor decreases Signup and view all the answers

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

The resistance of the conductor increases Signup and view all the answers

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

The resistance of the conductor increases Signup and view all the answers

Why is the filament in an incandescent bulb coiled?

To fit the filament into a small space while providing high resistance Signup and view all the answers

What is the purpose of using a Sankey diagram?

To illustrate the efficiency of energy transfer in different lighting systems Signup and view all the answers

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

The type of material used Signup and view all the answers

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

The longer the conductor, the higher the resistance Signup and view all the answers

What is the primary reason for resistance in a conductor?

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

What is the outcome of adding a resistor to a circuit?

The electric current decreases Signup and view all the answers

What is the main difference between a conductor and an insulator?

A conductor has lower resistance than an insulator Signup and view all the answers

What happens to the flow of electrons in a conductor when the resistance increases?

The flow of electrons decreases Signup and view all the answers

What is the purpose of delocalised electrons in a metal?

To allow the flow of electric current Signup and view all the answers

What occurs when an energy source is connected to a conductor?

The electrons move towards the positive terminal Signup and view all the answers

What is the main advantage of using LEDs over incandescent bulbs?

They are more energy-efficient Signup and view all the answers

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

It decreases the resistance Signup and view all the answers

Why do electrons encounter more collisions as they travel through a longer conductor?

Because the conductor has a longer length Signup and view all the answers

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

It increases the resistance Signup and view all the answers

What is the purpose of using a Sankey diagram in the context of energy transfer?

To illustrate the efficiency of energy transfer in different systems Signup and view all the answers

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

A larger cross-sectional area decreases the resistance 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 main reason why devices like cellphone chargers become warm during use?

Electrons colliding with the atoms of the material Signup and view all the answers

What is the primary function of a rheostat in a circuit?

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

Why do LEDs only allow current to flow in one direction?

Because they have very low resistance to current flow in one direction 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 advantage of LEDs over incandescent bulbs?

They are more efficient Signup and view all the answers

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

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

What happens to the movement of learners when they enter the narrow corridor and doorway during school break time?

It becomes restricted and slower Signup and view all the answers

What is the flow of electric charge in a circuit?

Electric current Signup and view all the answers

What happens when an energy source is connected to a conductor?

Electrons move towards the positive terminal Signup and view all the answers

What is the significance of delocalised electrons in metals?

They are free to move and carry electric current Signup and view all the answers

What is the effect of resistance on the flow of electrons in a circuit?

It opposes the flow of electrons Signup and view all the answers

What is the relationship between the flow of electrons and the electric current in a conductor?

The flow of electrons is proportional to the electric current Signup and view all the answers

What is the result of increasing the thickness of a conductor?

The resistance decreases Signup and view all the answers

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

The electrons decelerate Signup and view all the answers

What is the main difference between the movement of learners in the field and the corridor during school break time?

The movement is restricted in the corridor Signup and view all the answers

What is the primary purpose of a Sankey diagram in relation to lighting systems?

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

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

The resistance increases Signup and view all the answers

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

As the cross-sectional area increases, the resistance decreases Signup and view all the answers

What happens to the resistance of a conductor when its temperature increases?

The resistance increases Signup and view all the answers

Why are LEDs more efficient than incandescent light bulbs?

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

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

The resistance decreases Signup and view all the answers

What is the purpose of coiling the filament in an incandescent bulb?

To increase the length of the filament while keeping it compact Signup and view all the answers

What is the relationship between the type of material used in a conductor and its resistance?

Different materials have different inherent resistances Signup and view all the answers

What is the effect of increasing the resistivity of a conductor on its ability to conduct electricity?

It decreases the conductor's ability to conduct electricity Signup and view all the answers

Why do thicker wires have lower resistance than thinner wires?

Thicker wires have a larger cross-sectional area Signup and view all the answers

What is the main function of resistors in electrical circuits?

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

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

The material heats up and generates kinetic energy Signup and view all the answers

What is the purpose of a rheostat in a circuit?

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

What is the advantage of using LEDs over incandescent light bulbs?

LEDs produce more light with less electrical energy Signup and view all the answers

What is the characteristic of a diode?

It has high resistance to current flow in one direction Signup and view all the answers

What is the result of increasing the resistance in a circuit?

The current in the circuit decreases Signup and view all the answers

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

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

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

Signup and view all the answers

What happens when the resistance of a conductor increases?

The current in the circuit decreases Signup and view all the answers

What is the purpose of using a rheostat in devices such as sound equipment?

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

What is the primary reason for the inefficiency of incandescent bulbs?

Most of the electrical energy is wasted as heat. Signup and view all the answers

What is the effect of increasing the cross-sectional area of a conductor?

The resistance of the conductor decreases. Signup and view all the answers

Why do LEDs have a higher percentage of useful output energy compared to incandescent bulbs?

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

What happens to the resistance of a conductor when its temperature increases?

The resistance of the conductor increases. Signup and view all the answers

What is the purpose of coiling the filament in an incandescent bulb?

To fit the filament into a small space while providing high resistance. Signup and view all the answers

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

A longer conductor has higher resistance. Signup and view all the answers

What is the purpose of using a Sankey diagram?

To illustrate the efficiency of energy transfer in different lighting systems. Signup and view all the answers

What happens to the resistance of a conductor when its thickness decreases?

The resistance of the conductor increases. Signup and view all the answers

Why do thicker wires have lower resistance?

Because they have a larger cross-sectional area. Signup and view all the answers

What is the result of increasing the length of a conductor?

The resistance of the conductor increases. Signup and view all the answers

Why does the flow of electric charge become restricted in the corridor and classroom doorway during school break time?

As a result of the increase in resistance Signup and view all the answers

What is the primary reason for the movement of electrons towards the positive terminal in a circuit?

As a result of the connection to an energy source Signup and view all the answers

What is the significance of delocalised electrons in metals?

They allow the flow of electric charge Signup and view all the answers

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

It increases the resistance Signup and view all the answers

Why do electrons moving through a conductor collide with the atoms of the material?

As a result of the resistance in the conductor Signup and view all the answers

What is the relationship between the flow of electrons and the electric current in a conductor?

The flow of electrons is the same as the electric current Signup and view all the answers

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

It increases the resistance Signup and view all the answers

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

To allow the flow of electric charge Signup and view all the answers

What is the result of connecting an energy source to a conductor?

It increases the electric current Signup and view all the answers

What is the effect of resistance on the flow of electrons in a circuit?

It decreases the flow of electrons Signup and view all the answers

What is the primary reason why resistors are used in electrical circuits?

To control the flow of electrons and prevent overheating Signup and view all the answers

What is the effect of increasing the resistance in a circuit?

The current in the circuit decreases Signup and view all the answers

What is the purpose of a rheostat in a circuit?

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

What is the primary reason why LEDs are more efficient than incandescent bulbs?

All of the above Signup and view all the answers

What is the effect of electron collisions with the atoms of a conductor?

The conductor generates heat Signup and view all the answers

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

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

What is the characteristic of a diode?

It has low resistance to current flow in one direction and high resistance in the other Signup and view all the answers

What is the result of increasing the resistance in a circuit with a rheostat?

The current in the circuit decreases Signup and view all the answers

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

To control the flow of electrons and prevent overheating Signup and view all the answers

What is the relationship between input energy, output energy, and energy wasted in a system?

Input energy is converted into output energy and some energy is wasted Signup and view all the answers

What is the primary reason for the restricted movement of learners in the corridor and classroom doorway during school break time?

The physical space is narrower Signup and view all the answers

What happens to the delocalised electrons in a conductor when an energy source is connected?

They move towards the positive terminal Signup and view all the answers

What is the effect of resistance on the flow of electrons in a circuit?

It decreases the flow of electrons Signup and view all the answers

What is the significance of delocalised electrons in metals?

They can move freely and carry electric current Signup and view all the answers

What is the relationship between the flow of electrons and the electric current in a conductor?

The flow of electrons is in the same direction as the electric current Signup and view all the answers

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

To allow the flow of electric charge Signup and view all the answers

What is the primary purpose of using a resistor in series with an LED?

To decrease the current flowing through the LED Signup and view all the answers

How does the resistance of a conductor change when its temperature increases?

It increases Signup and view all the answers

What is the primary function of a rheostat in a circuit?

To adjust the resistance in a circuit Signup and view all the answers

Why are LEDs more efficient than incandescent bulbs?

They convert more electrical energy into light Signup and view all the answers

What is the primary reason for using a diode in a circuit?

To control the direction of current flow Signup and view all the answers

What is the primary effect of increasing the resistance in a circuit?

The current decreases Signup and view all the answers

What is the primary cause of energy wastage in incandescent bulbs?

High energy conversion into heat Signup and view all the answers

What is the effect of increasing the cross-sectional area of a conductor on its resistance?

It decreases the resistance Signup and view all the answers

What is the primary factor that affects the resistance of a conductor, according to the formula R = ρL/A?

Cross-sectional area of the conductor Signup and view all the answers

What is the result of electrons moving through a conductor with high resistance?

Electrons move slower and less efficiently Signup and view all the answers

What is the purpose of coiling the filament in an incandescent bulb?

To increase the resistance of the filament Signup and view all the answers

What is the primary advantage of using LEDs over incandescent bulbs?

LEDs are more energy-efficient and waste less energy as heat Signup and view all the answers

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

It increases the resistance Signup and view all the answers

What is the primary function of a Sankey diagram in illustrating the efficiency of energy transfer in different lighting systems?

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

Gr 9 NATURAL SCIENCES: CH 3.3 SUM Resistance

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Questions and Answers

What is the definition of resistance?

What represents a low resistance environment in the break time scenario?

What is an electrical component that adds resistance to a circuit?

What is the term for electrons that are not associated with a particular atom and can move freely?

What is the unit of measurement for resistance?

What causes electrons to move towards the positive terminal, creating an electric current?

What is the term for a material that allows the flow of electric charge?

What opposes the flow of electrons in a circuit?

What is the rate at which electric charge flows through a conductor in a closed circuit?

What is the property of matter that causes it to experience a force in an electric field?

What percentage of electrical energy is converted into light in an incandescent bulb?

What percentage of electrical energy is wasted as heat in an LED?

Which of the following factors affects the resistance of a conductor?

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

What is the term for the ability of a material to conduct electricity?

What is the purpose of resistors in electrical circuits?

What happens to the resistance of a conductor when its thickness increases?

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

What is the function of a rheostat in a circuit?

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

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

What happens to the resistance of a conductor when its temperature increases?

What is a characteristic of a diode?

Why does the filament in an incandescent bulb heat up and emit light?

Why are LEDs more efficient than incandescent light bulbs?

What is the purpose of coiling the filament in an incandescent bulb?

How many primary factors affect the resistance of a conductor?

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

What is the result of increasing the resistance in a circuit?

What is the purpose of resistors in controlling the brightness of a light bulb?

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

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

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

What is the function of a rheostat in a circuit?

Why are LEDs more efficient than incandescent light bulbs?

What is the result of collisions between electrons and the atoms of a conductor?

What is the main reason why movement becomes restricted in the corridor and classroom doorway during school break time?

What is the result of connecting an energy source to a conductor?

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

What is the effect of resistance on the flow of electrons in a circuit?

What is the significance of delocalised electrons in metals?

What is the relationship between the flow of electrons and the electric current in a conductor?

What is the main difference between incandescent bulbs and LEDs?

What is the effect of increasing the cross-sectional area of a conductor?

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

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

Why is the filament in an incandescent bulb coiled?

What is the purpose of using a Sankey diagram?

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

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

What is the primary reason for resistance in a conductor?

What is the outcome of adding a resistor to a circuit?

What is the main difference between a conductor and an insulator?

What happens to the flow of electrons in a conductor when the resistance increases?

What is the purpose of delocalised electrons in a metal?

What occurs when an energy source is connected to a conductor?

What is the main advantage of using LEDs over incandescent bulbs?

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

Why do electrons encounter more collisions as they travel through a longer conductor?

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

What is the purpose of using a Sankey diagram in the context of energy transfer?

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

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

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

What is the main reason why devices like cellphone chargers become warm during use?

What is the primary function of a rheostat in a circuit?

Why do LEDs only allow current to flow in one direction?

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

What is the main advantage of LEDs over incandescent bulbs?

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

What happens to the movement of learners when they enter the narrow corridor and doorway during school break time?

What is the flow of electric charge in a circuit?

What happens when an energy source is connected to a conductor?

What is the significance of delocalised electrons in metals?

What is the effect of resistance on the flow of electrons in a circuit?

What is the relationship between the flow of electrons and the electric current in a conductor?

What is the result of increasing the thickness of a conductor?