The earthwire is connected to the metal casing. If the live wire touches the metal casing instead of the metl conducting the electricity, it flows down the earth wire instead and into the ground.
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What appliances need an earth wire?
Appliances with a metal casing. Unless they have double insulation.
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How does a circuit breaker act as a safety device?
It does the same job as a fuse. If a fault occurs and the current gets too high, the electromagnet attracts the switch causing the circuit to break.
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What are the advantages of a circuit breaker compared to a fuse?
They work quicker and are easily reset.
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How does a residual current circuit breaker(RCCB) work?
It works faster than a normal circuit breaker. They detect a difference in current between the live and neutral wire.
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Other cards in this set
Card 2
Front
What appliances need an earth wire?
Back
Appliances with a metal casing. Unless they have double insulation.
Card 3
Front
How does a circuit breaker act as a safety device?
Back
Card 4
Front
What are the advantages of a circuit breaker compared to a fuse?
Back
Card 5
Front
How does a residual current circuit breaker(RCCB) work?
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