45 Questions
What is the relationship between voltage, current, and resistance described by?
Ohm's Law
What is a material that allows electric charge to flow through it easily?
Conductor
What is the purpose of resistors in electrical circuits?
To add resistance
What symbol represents a resistor in circuit diagrams?
R
What causes resistance at the microscopic level?
Electrons colliding with atoms
What happens to the kinetic energy of electrons when they collide with atoms in a conductor?
It is transferred
Why do devices like cellphone chargers become warm during use?
Due to resistance
What is the formula that describes the relationship between voltage, current, and resistance?
V = IR
What is the movement of electric charge in a circuit referred to as?
Electric current
What is the term for electrons that are not associated with a particular atom and can move freely?
Delocalised electrons
What is the unit of measurement for resistance?
Ohms
What is the purpose of a resistor in an electrical circuit?
To add resistance to a circuit
What is the scenario that represents a low resistance environment?
Open field
What is the term for a material that allows the flow of electric charge?
Conductor
What causes the electrons to move towards the positive terminal in a circuit?
An energy source
What is the measure of how much a material opposes the flow of electric current?
Resistance
Which of the following is an example of a low resistance environment?
Open field
What kind of electrons are free to move and carry electric current in metals?
Delocalised electrons
What is the purpose of connecting an energy source to a conductor?
To cause the electrons to move towards the positive terminal
What is the effect of resistance on the flow of electrons in a circuit?
It opposes the flow of electrons
What is the term for a material that allows the flow of electric charge?
Conductor
What is the unit of measurement for the rate of flow of electric charge?
Amperes
What is the effect of collisions between electrons and atoms in a conductor?
The material heats up
What is the purpose of using resistors in electrical circuits?
To add resistance to the circuit
What type of material is characterized by having low resistance?
Conductor
What happens to the electrons in a conductor when they collide with atoms?
They lose kinetic energy
Which of the following is an example of a conductor?
Copper wire
What is the effect of increasing the resistance in a circuit?
The current decreases
What is the relationship between the current and resistance in a circuit?
As current increases, resistance increases
What happens when electric charge flows through a material with high resistance?
The material heats up
What is the primary reason why devices like cellphone chargers heat up during use?
Electrons colliding with the atoms of the conductor material
What happens to the kinetic energy of electrons during collisions with atoms in a conductor?
It is transferred to the atoms, causing heat
Why do conductors have some resistance?
Because electrons collide with the atoms of the conductor material
What is the main difference between a conductor and a resistor?
Conductors allow electric charge to flow easily, while resistors do not
What is the result of decreasing the resistance in a circuit?
The current in the circuit will increase
What is the relationship between the voltage and current in a circuit, according to Ohm's Law?
Voltage is equal to the product of current and resistance
Why are resistors used in electrical circuits?
To add resistance to the circuit, controlling the flow of electric charge
What happens to the flow of electric charge when it encounters a resistor in a circuit?
It is impeded, but not stopped
What is the main reason why the movement of electrons is restricted in the corridor and doorway of the school building scenario?
The conductor's cross-sectional area is reducing
What is the primary function of an energy source, such as a battery, in an electrical circuit?
To cause the electrons to move towards the positive terminal
What is the primary characteristic of a conductor that allows it to facilitate the flow of electric charge?
The electrons are delocalised and can move freely
What is the effect of increasing the number of collisions between electrons and atoms in a conductor?
The flow of electric charge becomes more restricted
What is the relationship between the resistance of a material and its ability to conduct electric charge?
A material with high resistance is a poor conductor
What is the primary reason why a material with high resistance is not suitable for use in electrical circuits?
It is not a good conductor of electric charge
What is the main difference between a conductor and a resistor?
A conductor has low resistance, while a resistor has high resistance
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