explain the construction of a fuse wire

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Solution

Suppose a fuse wire has resistance R and it is made for maximum current I then it will be built in such a way that if $H = I^{2} R$ heat is generated then the wire will melt and hence disconnect the electrical power supply.

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Similar questions

(a) Of what substance is the fuse wire made ? Why ?

(b) Explain why, a copper wire cannot be used as a fuse wire.

Complete the following sentences :

(a) A fuse is a short piece of wire of high ___ and of the material of low ___.

(b) A fuse wire is made of an alloy of ___ and ___ if the current in a circuit exceeds the current rating of the fuse wire, it ___.

(d) Higher the current rating, ___ is the fuse wire.

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