What is the purpose of a fuse in an electrical circuit?

A fuse plays a critical role in an electrical circuit by serving as a protective device designed to prevent electrical overload. When too much current flows through a circuit, it can generate excessive heat, which may lead to overheating of wires, potential fire hazards, or damage to electrical components. The fuse contains a metal strip or wire that melts when the temperature exceeds a specified limit, effectively breaking the circuit and stopping the flow of electricity. This mechanism helps safeguard the entire system by ensuring that any potential overload is addressed before it can cause damage.

The other options relate to different functions that aren’t associated with a fuse. For example, increasing current flow or amplifying a signal involves using components like conductors or amplifiers, rather than fuses. Measuring voltage is done using specific devices called voltmeters or multimeters, again distinct from the protective role of a fuse. Thus, the primary and crucial purpose of a fuse is to prevent electrical overload, ensuring safe operation of electrical circuits.