A heater's earth wire has broken. A fault then connects its live wire to the metal case. The fuse has not melted.
A person touches the case and an earthed tap at the same time. Which pair describes the potential difference and the possible current path?
About 0 V0\ \mathrm{V}0 V; case through person to tap.
About 230 V230\ \mathrm{V}230 V; tap through earth wire to case only.
About 230 V230\ \mathrm{V}230 V; case through person to tap.
About 0 V0\ \mathrm{V}0 V; live wire through fuse to neutral only.
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.