A fuse in an appliance melts when the current becomes too large. Why does this reduce the risk of fire?
It breaks the circuit and stops current in the cable.
It lowers the supply voltage and cools the cable.
It diverts the normal current into the earth wire.
It increases the current and reduces the resistance.
81 exam-style questions on Edexcel GCSE Physics 10.4 Mains electricity, covering 10.4.1 Direct and alternating current, 10.4.2 Live, neutral and earth wires; safety, 10.4.3 Mains wire potential differences and dangers, and 10.4.4 Power ratings and energy use. Each one has a worked solution and a mark scheme showing where the marks go.