How does a fuse wire protect an electric circuit?
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The fuse breaks the circuit if a fault in an appliance causes too much current to flow. This protects the wiring and the appliance if something goes wrong. If the current going through the fuse is too great, the wire heats up until it melts and breaks the circuit. ...
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A fuse is always connected in the live wire before the appliance so that if the current in the circuit exceeds its safe limit, it melts breaking the circuit and thereby safeguarding the appliance.
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