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2.3 Domestic uses and safety

2.3 Domestic uses and safety

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Question 5

An electrical appliance is connected to the mains supply using a standard three-core cable containing a fuse.

a.

What colour is the insulation covering the neutral wire in a three-core mains cable?

[1]
b.

A fuse wire melts to break the circuit when a charge of 1.5 C1.5\text{ C}1.5 C flows through it in 250 ms250\text{ ms}250 ms. Calculate the current in the fuse wire.

[2]
c.

When the fuse wire reaches its melting point, an additional energy of 0.84 J0.84\text{ J}0.84 J is needed to melt it completely.

The specific latent heat of fusion of the fuse wire is 75 kJ/kg75\text{ kJ/kg}75 kJ/kg.

Calculate the mass of the fuse wire.

[2]
d.

If some energy is transferred from the wire to the surroundings during heating, state how the time taken for the wire to melt would change and explain why.

[2]
Markscheme

2.3 Domestic uses and safety Questions

  1. GCSE
  2. /Physics
  3. /2.3 Domestic uses and safety

9 exam-style questions on AQA GCSE Physics 2.3 Domestic uses and safety, covering 2.3.1 Direct and alternating potential difference and 2.3.2 Mains electricity. Each one has a worked solution and a mark scheme showing where the marks go.

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