Question

Fuse wire is made up of an alloy of ____ which has high resistance and ___ (high / low) melting point.

Answer 1

Hint:The fuse is a device that protects the electrical appliances from excess current entering the circuit, which could damage them. The fuse breaks the wire present in the fuse, hence the circuit breaks and thus our electrical device is saved from the damage the wire inside the fuse is called fuse wire.

Complete answer:
We know that materials with greater resistance produce more heat when current is passed through them and hence get more heated compared to materials with lower resistance. Material with a lower melting point gets melted before the material with a higher melting point.
The fuse wire in a fuse gets melted easily as the value current exceeds the permissible value thus it must be made of a material of high resistance and low melting point.
Therefore the fuse wire is made of an alloy of Tin and Lead due to their high resistance and low melting point.
Hence the correct answer to the above question is tin and lead, and Low.
Fuse wire is made up of an alloy of tin/lead which has high resistance and low melting point.

Additional information:
Tin, lead, silver, copper, zinc, aluminum, and an alloy of lead and tin are other metals that are also used more specifically for making the fuse wire.

Note:
The heat energy produced in a resistor when a current is flown through it is directly proportional to the resistance of the resistor and directly proportional to the square of current passing through the resistor. The high resistance of an alloy is due to the high resistivity of the material.