A ceiling lamp is connected to the mains supply.
By mistake, the switch for the lamp has been connected in the neutral wire instead of the live wire.
The switch is open, so the lamp is off.
Explain why it is still dangerous to touch the metal contacts inside the lamp holder.
Explain why the switch should be connected in the live wire.
The lamp has a plastic case.
Explain how the plastic case protects a person who touches the lamp.
16 exam-style questions on OCR GCSE Physics 8.2 Powering Earth, covering 8.2.1 Renewable and non-renewable energy resources, 8.2.2 Patterns and trends in energy use, 8.2.3 The national grid, 8.2.4 Step-up and step-down transformers, 8.2.5 Efficiency of the national grid, 8.2.6 Transformers and power transmission at high voltage, 8.2.7 The UK domestic supply, 8.2.8 Direct and alternating potential difference, 8.2.9 Live, neutral and earth wires, and 8.2.10 Dangers of mains electricity. Each one has a worked solution and a mark scheme showing where the marks go.