A metal-cased appliance is not earthed. A fault makes the live wire touch the metal case. A person standing on the ground touches the case. What is the approximate potential difference across the person?
About 230 V, because the case is now at the live potential
About 230 V, because the case is now at the earth potential
About 0 V, because the case is joined to the neutral wire
About 460 V, because the case is joined to both supply wires
40 exam-style questions on AQA GCSE Physics 2.3 Domestic uses and safety, covering 2.3.1 Direct and alternating potential difference and 2.3.2 Mains electricity. Each one has a worked solution and a mark scheme showing where the marks go.