GCSE Standard Questions: Electricity in the Home

Q19. The photo shows an electric car being recharged.

(a) The charging station applies a direct potential difference across the battery of the car.

What does 'direct' potential difference mean?

[1 mark]

(b) The battery in the electric car can store 162 MJ of energy.

The charging station has a power output of 7.2 kW.

Calculate the time taken to fully recharge the battery from zero.

[5 marks]

There is a current of 15 A in the circuit connecting the battery to the motor of the electric car.

Calculate the resistance of the motor.

[4 marks]

(d) Different charging systems use different electrical currents.

Charging system A has a current of 13 A.

Charging system B has a current of 26 A.

The potential difference of both charging systems is 230 V.

Tick the box that correctly compares the time taken to recharge a battery using charging system A with the time taken using charging system B.

Time taken using system A is half the time of system B
Time taken using system A is the same as system B
Time taken using system A is double the time of system B

[1 mark]

(Total 11 marks)