A technician checks the supply terminals of a refrigerated display cabinet while it is connected to a normally operating UK mains supply. A voltmeter is connected first between the live and neutral terminals, and then between the live and earth terminals.
Which statement describes the two voltmeter readings?
The full mains value for live and neutral, about zero for live and earth.
About zero for live and neutral, the full mains value for live and earth.
Approximately zero potential difference for each reading.
About the full mains potential difference for each reading.
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.