GCSE Physics Unit 2 Revision (11)

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Fuses and Earthing

  • Mains Cables have 3 separate wires.
  • The brown live wire in a mains supply alternates between a high positive and negative voltage. 
  • The blue neutral wire is always at 0V.
  • Electricity only flows in and out through the live and neutral wires normally.
  • The green and yellow earth wire is just for safety, and works together with a fuse to prevent fire and shocks.
  • Fuses prevent electric shocks.
  • To prevent surges of current in electrical circuits and danger of electric shocks, a fuse is normally placed in the circuit. You can sometimes use a circuit-breaker, which is like a resettable fuse.
  • If the current in the circuit gets…


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