LIVE WIRE - Carries a high voltage around the house.
NEUTRAL WIRE - Completes the circuit, return path for the current.
EARTH WIRE - Connected to the casing of something to stop it being live.
-If a circuit becomes too large, the fuse contains a wire which melts breaking the circuit.
-Current can't flow, which stops overheating and damage to the appliance.
-Fuses stop a person recieving an electric shock because as soon as the casing becomes live, a large current flowws in the earth and live wires and the fuse 'blows'.
-A circuit breaker (re-settable fuse) doesn't need to be replaced, it can just be reset.
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