GCSE Electricity: Circuits and Components

Q1.

A phone charger operates at 5 V and supplies a current of 2 A to the phone. What is the power output of the charger?

**Fig:** A phone charger charging a smartphone

1. 10 W
2. 7 W
3. 2.5 W
4. 20 W

Q2.

Which of the following statements correctly describes how an Ammeter should be connected in a circuit to measure the current flowing through a component?

1. In series with the component.
2. In parallel with the component.
3. Across the component, with one lead on each side.
4. Directly to the power supply, bypassing the component.

Q3.

Which of the following statements best describes the behavior of a diode in a circuit?

1. A diode allows current to flow equally well in both directions.
2. A diode's resistance increases as the current through it increases.
3. A diode blocks current flow regardless of the direction.
4. A diode allows current to flow primarily in one direction only.

Q4.

A lamp has a power rating of 6 W. It is connected to a 12 V DC supply. What is the current flowing through the lamp?

1. 0.5 A
2. 72 A
3. 5 A
4. 2 A

Q5.

A thermistor is connected in a circuit with a constant voltage power supply.

What happens to the current flowing through the thermistor when it is heated?

1. The current increases.
2. The current initially increases, then decreases.
3. The current decreases.
4. The current remains the same.

Q6.

A small electric motor has a power rating of 36 W. It is connected to a 12 V DC supply. What is the current flowing through the motor?

**Fig:** Calculate the current passing through a 36W motor at 12V supply

1. 0.33 A
2. 30 A
3. 432 A
4. 3 A

Q7.

Which of the following statements best describes how the resistance of a thermistor changes with temperature?

1. The resistance of a thermistor increases as the temperature increases.
2. The resistance of a thermistor decreases as the temperature increases.
3. The resistance of a thermistor remains constant regardless of temperature.
4. The resistance of a thermistor increases linearly with temperature.

Q8.

Which of the following statements correctly describes how a Voltmeter should be connected in a circuit to measure the potential difference (voltage) across a component?

1. In series with the component.
2. In parallel with the component.
3. Directly to the power supply, bypassing the component.
4. In any configuration, as long as it touches the component.

Q9.

Which of the following statements best describes the purpose of a joulemeter?

1. It measures the rate of flow of charge in a circuit.
2. It measures the total energy transferred in a circuit or component.
3. It measures the potential difference between two points in a circuit.
4. It measures the force exerted on a moving charge in a magnetic field.

Q10.

What do the letters LDR stand for?

**Fig:** Picture of an LDR on a circuit board

1. light-dependent resistor
2. Light-dependable resistor
3. light-direct resistor

GCSE Electricity: Circuits and Components

Subject: Physics

Level: Intermediate