Question

Complete the following sentences:
A fuse is a short piece of wire of high ______ and of material of low _____.
A) Resistance, melting point
B) Melting point, resistance
C) Capacitance, melting point
D) Conductance, melting point

Answer 1

Hint:- The purpose of fuse wires is to protect the electrical appliances from excess current accidently flowing to the circuit. Thus the material of the fuse wire should be able to not allow the high current into the circuit. It should prevent the high current entering.

Complete Step by step solution:

The fuse is a system that works voluntarily in order to avoid more power to enter into the circuit. The fuse wire is used to protect the electrical appliances. The fuse wire thus should have a low melting point such that the circuit would be incomplete due to melting because of high current. The excess heat resulting in melting is due to the high current flows in the fuse wire. Thus the fuse wire will help to avoid high current passing through the circuit. This helps to keep the electrical appliances safe.
Thus the low melting point and high resistance of the material of wire will help to break the circuit when high magnitude current flows to the circuit.

The answer is option A.

Note: We have to note that the high resistance wires can only hold high current. And when high current passes through a wire it will result in the excess heat dissipation. And for low resistance wire only a large amount of current can pass but they can’t hold it resulting in heat dissipation.