An electrical appliance is connected to the mains supply using a standard three-core cable containing a safety fuse.
State the colour of the insulation covering the live wire in a standard three-core mains cable.
A fuse wire melts to isolate the appliance from the mains when a charge of 2.4 C flows through it in 160 ms. Calculate the electric current in the fuse wire during this interval.
When the fuse wire reaches its melting point, an additional energy of 1.35 J must be absorbed to melt it completely.
The specific latent heat of fusion of the fuse alloy is 90 kJ/kg.
Calculate the mass of the fuse wire.
In reality, some energy is transferred from the wire to the surrounding casing during the heating process. State how this energy transfer affects the time taken for the fuse to blow, and explain your answer.
Practise AQA GCSE Physics Domestic uses and safety with exam-style questions for Foundation and Higher tier. 13 questions covering Direct and alternating potential difference and Mains electricity, matched to the AQA GCSE Physics (8463) specification and written in Paper 1 and Paper 2 style. Every question includes a full worked solution and mark scheme, so you can see where marks are awarded rather than just whether you got the answer right.