Cambridge IGCSE Physics4.4 Electrical safety Worksheet
16 questions · 49 marks · Word
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What objectives does this worksheet meet?
Core
- I can state the hazards of:a)damaged insulationb)overheating cablesc)damp conditionsd)excess current from overloading plugs, extension leads, and single and multiple sockets when using a mains supply
- I know that a mains circuit is made up of a live wire (line wire), a neutral wire and an earth wire, and I can explain why a switch must be connected to the live wire for the circuit to be switched off safely.
- I can explain how trip switches and fuses are used and how they work, and choose suitable fuse ratings and trip switch settings.
- I can explain why the outer casing of an electrical appliance must be either non-conducting (double-insulated) or earthed.
- I can state that, for a double-insulated appliance, a fuse without an earth wire protects the circuit and the cabling.