Question

Fuse wire is made up of an alloy of………….which has high resistance and…………

Answer 1

We have to fulfill the purpose of the fuse in our daily life circuits so we have to use that material which has required properties and low cost. The materials have high resistance and law melting point so whenever the voltage supply suddenly increases the wire melt and other circuits can be saved.

Complete step-by-step answer:
The fuse is being used in our daily life equipment because whenever the flow of current suddenly high we observed that the fuse melts and the current in the whole circuit goes off. If the fuse is not there then may happen that our equipment is damaged.
To overcome this problem our scientists develop an equipment fuse. So the fuse should be very resistive whenever a very high current passes through it its resistance becomes high due to$V=IR$. Because high current passes through fuse wire according to Joule’s heat law very high energy produces in wire, if wire is made of low melting point material like pure tin or tin-lead alloy it easily melts and saves other equipment by circuit loss.
So, Fuse wire is made up of an alloy of tin-lead which has high resistance and low melting point.

Additional Information:
The fuse wire is composed of $62\%$ tin(Sn) and $38\%$ lead(Pb) mixed alloy.

Note: Fuse wire is work on two principles. One of them is Ohm’s law and the other one is Joule’s heating law.
Ohm’s law: $V=IR$
Where $V$ is the voltage, $I$ is the current and R is the resistance of the conductor.
Joule’s heating law: $H={{I}^{2}}Rt$
Where $H$ is Joule heat, $I$ is current, $R$ is the resistance and t is the time during current passing through the conductor.