In which of the following cases, the fuse operates to break the circuit?

Underloading

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Overloading

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Short circuit

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(b) and (c) above.

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Solution

The correct option is D (b) and (c) above.
A fuse operates when excessive current flows through the circuit. In a short circuit, two wires come in contact creating a low resistance path that allows a huge current.
In overloading, too many appliances are used through a single wire causing a huge amount of current to flow.

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