Cambridge IGCSE Physics
4.4Electrical safety
Electrical safety in Cambridge IGCSE Physics: what the syllabus expects you to know, the learning objectives and how to practise.
Subtopic12 practice questions1 lesson
Learning objectives
What the syllabus expects you to be able to do.
- 4.4.1State the hazards of damaged insulation, overheating cables, damp conditions and overloaded plugs, extension leads and sockets on the mains.
- 4.4.2Know that a mains circuit has live, neutral and earth wires, and explain why the switch must be in the live wire.
- 4.4.3Explain how trip switches and fuses work and choose suitable fuse ratings and trip settings.
- 4.4.4Explain why an appliance's outer casing must be either double-insulated or earthed.
- 4.4.5State that, for a double-insulated appliance without an earth wire, the fuse protects the circuit and cables.
Lessons
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Mains electricity and electrical safety
32 min
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Sample question
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