Question

What is the meaning of the statement “the current rating of a fuse is 5A”?
A. Maximum 10A pass through it after it will melt
B. Maximum 5A pass through it after it will melt
C. Maximum 2A pass through it after it will melt
D. Maximum 1A pass through it after it will melt

Answer 1

Hint: Define a fuse and how it works. A fuse allows a certain amount of electricity to pass through it. If the current through the fuse is more than the required amount, it will melt down to prevent the flow of current through it. Current rating depends on that maximum current flow through the fuse.

Complete step by step answer:
Fuse in an electrical safety device which is used to protect electrical appliances from flowing overcurrent through the device and destroying it. It consists of a metal wire which melts when a large amount of current or current greater than the desired amount flows through it and thereby stopping the current.
Current rating of a fuse can be defined as the maximum current that can be passed through a fuse. If the current is greater than the fuse rating, the fuse will melt and the current flow will stop.
So, if we consider that the current rating of a fuse is 5A, it means that current only lower than or equal to 5A can pass through it. If the current is greater than 5A, the fuse will melt and thereby stops the current flow.
The correct option is (B).

Note: We have different types of fuse depending on its work. Each of the different types of fuse works differently and are useful for different electric appliances. The advantage of a fuse is that it does not need any maintenance and the price is also very low. It works automatically when current flow becomes greater than the required amount.