GCSE Standard Questions: Electricity in the Home

Q6. The plug of an electrical appliance contains a fuse. The diagram shows the structure of a fuse.

(a) Which of the following is the correct circuit symbol for a fuse?

[1 mark]

(b) The appliance is connected to the mains electrical supply.

The mains potential difference is 230 V.

Calculate the energy transferred when 13 C of charge flows through the appliance.

[3 marks]


(i) Write down the equation that links charge flow, current and time.

[1 mark]

(ii) The fuse wire melts when 1.52 coulombs of charge flows through the fuse in 0.40 seconds. Calculate the current at which the fuse wire melts.

[3 marks]

(d) The mass of the fuse wire is 0.00175 kg.

The specific latent heat of fusion of the fuse wire is 205 000 J/kg.

Calculate the energy needed to melt the fuse wire.

[3 marks]

(Total 10 marks)