When a fuse is rated 8A, it means:

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It will not work if current is less than 8A

It has a resistance of 8 Ω

It will work only if current is 8A

It will burn if current exceeds 8A

answer is D.

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Detailed Solution

When a fuse has a rated current of 8A, it means that it will blow if the current exceeds 8A.
The fuse acts as a barrier when any overcurrent accidentally passes through the circuit. This is done by melting the fuse which breaks the circuit connection. So when we say that a fuse is rated at 8A, we mean that if the current exceeds 8A, the fuse will break to prevent accidents.

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