Fuse-
The fuse is a weak point that will melt when a current is too high and unsafe for the wire (which could cause electric fires). When the fuse melts the circuit breaks.
Circuit breaker-
This is a resettable fuse. It is more convinient yet more expensive.
Earth wire-
The earth wire connects the metal case of an object, E.g a laptop, to the earth.
If a fault develps the case becomes live, the large current flows through the case, down the earth wire to the eath. it is a safer way to get the current to the earth.
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