A metal-cased ticket machine is correctly connected to the mains by a three-core cable. A fault causes the live conductor inside it to touch the metal case. The plug contains a fuse.
Explain how the earth wire and the fuse reduce the risk to a person who touches the case.
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.