A metal-cased appliance operates normally after its earth wire has broken. Later, its live wire touches the metal case.
Which statement explains the extra danger caused by the broken earth wire?
The missing earth connection increases the appliance's normal current.
There is no low-resistance earth path to produce a large fault current.
The missing earth connection makes the mains supply become direct.
There is no neutral connection to carry the appliance's normal current.
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.