Question

why is a fuse wire necessary in a circuit?How does it work?what happens if the fuse wire is made up of alloy with high melting point

Answer 1

fuse wire is necessary in a circuit for prevention of short circuiting and overloading.
the fuse wire is connected in the series with the battery,when the current increases than a specific value then the fuse wire melts and the circuit breaks ,the electric devices remains safe.
the fuse wire is usually made of copper or aluminium wire...

Answer 2

fuse wire is necessary as to prevent short circuit if fuse is broken it can lead to short circuit.

hope it helps : )