Question

If a fuse is rated as $8A$ , and current more than $8A$ passes through it then
(A) it would melt
(B) circuit gets broken
(C) both
(D) none

Answer 1

Hint : The maximum amount of current that can flow through a fuse is known as its rating. The higher the rating of the fuse, the higher the current the fuse can stand by. Therefore, the main use of the fuse is to save the appliances from getting higher current.

Complete Step By Step Answer:
Fuse is a widely known safety device which is used in households and different areas where current is used. Its basic function is to stop the appliances from getting higher current from that which they want. It is made up of a metal wire or a strip which gets melted down when higher current than its rating is flowed through the fuse. This melting down stops the further more current to get into the appliances and affect them.
There are also different types of fuses. The most common one is the cartridge fuse, others are automated fuses, resettable fuses, semiconductor fuses, overvoltage suppression etc.
Now, if a fuse is rated at $8A$ that means the rating of the fuse is $8A$ and no more than $8A$ current can flow through it.
And if you provide that fuse with the current more than $8A$ , then its wires get melted down and the circuit gets broken, saving the appliances to get affected.
Option (C) is correct.

Note :
Always remember that the rating of the fuse is dependent on the metal strip or wire which is in it. The length of the virus ship does not matter, but the thickness of the wire or strip give us an idea of how much current can flow. More the thickness of the wire, the more current can flow.