A metal screw used to fix a timber wall panel pierces a concealed mains cable. The screw makes electrical contact with both the live and neutral cores.
Explain how this fault could cause the timber to catch fire.
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.