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why is the fuse wire necessary in a circuit?how does it work?

it is necessary because when execess amount of electricity has been flowed so the fuse takes thatexecess amountof electricityon it and protects our home from short circuit or fire.

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If a current larger than the specified value the temprature of the fuse wire increases to its melting point ,then the fuse wire melts and the circuit breaks and hence protects from short circuits
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Why is it necessary to excrete waste materials?
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