Question

Which of the following acts as a circuit protecting device?
A. Conductor
B. Inductor
C. Switch
D. Fuse

Answer 1

Any material which helps to break the circuit so that no excess current pass through it is known as a circuit-breaking device. If any excess current passes through a circuit it destroys the circuit.

Complete step-by-step answer:
The melting point of fuse wire is very low so when excess current flows and heats up the fuse wire which results in the melting of the wire and cuts the circuit. Hence it acts as a circuit-protecting device.

Additional Information:
The fuse wire is made up of high resistance and low melting material preferably Sn (tin) and Pb (lead) alloy.
A conductor is an object or a material which allows flows of charge in one or more directions.
An inductor is a passive two-terminal electrical component that stores energy in a magnetic field when current flows through it. It is also called a coil, chokes, or reactor, It typically cores wounded by insulator wire.
A switch is a basic electrical device that allows or disallows the flow of current.
An electrical circuit is made up of individual components, resistor, inductor, capacitor, fuse, switch, diodes, and between them electrical conducting wires.
The metals suitable for making wire must possess almost equal ductility, the materials are platinum, silver, iron, copper, aluminum, and gold, and only from these metals and their certain alloys with other metals, principally bronze and brass, electrical wire is prepared.

Note: A switch also breaks the current flow/ circuit but it’s not a circuit-protecting device as it does not provide self breakage of circuit current it has to be used manually whereas a fuse is a self-protection device because it breaks whenever a short circuit is detected.