Question

Electric fuse is a wire made of material having
(A) Low melting point
(B) High melting point
(C) Moderate melting point
(D) None of these

Answer 1

Hint: The wire which blows off because of heating or we can say because of current increment in circuit easily should be used for electric fuse.
Because this type of wire can easily protect the system.

Complete step by step answer:
Generally the fuse wire is a part circuitry, contributing to a complete loop for changes to flow through it.
Fuse wire is an essential component, which is a metal or strip that melts when too much current flows through it. Thereby stopping the current.

Hence, fuse wire should melt to break the circuit. It is possible when a fuse is made of material with a low melting point like copper and lead alloy.

Low melting point will let it break when high current passes through it because of the heat generated.
Therefore, option A is the correct answer.
Option B or C are incorrect as if the fuse will have a high or moderate melting point, it will not break the circuits which can damage our electrical appliances due to high load.

Therefore, option A is the correct answer.

Note:
Many times students may get confused between short circuit and open circuit.
Short circuit – A short circuit is an electrical circuit that allows a current to travel along an unintended path with very low resistance. This results in an excess current flowing through it.
E.g., electric fuse.
Open circuit – An open circuit implies that the 2 terminals are externally disconnected, which is equivalent to a resistance $R = \infty $. This means that zero current flows between 2 terminals.