What is the function of an electrical fuse?

The function of an electrical fuse is to protect circuits from overload or short circuits. A fuse is designed to be a safety device that interrupts the flow of current when it exceeds a certain limit, which can occur due to overload conditions or short circuits. When the current flowing through the fuse exceeds its rated capacity, the fuse element melts, breaking the circuit and preventing damage to the electrical system or connected devices. This protective mechanism helps reduce the risk of overheating, fires, or equipment damage caused by excessive current flow.

The other options describe functions that are not related to the purpose of a fuse. Providing a direct path for current does not characterize a fuse, as a fuse is not meant to facilitate uninterrupted current flow under all conditions. Increasing voltage is the role of transformers or power supplies, not fuses, which are concerned with current safety. Similarly, converting mechanical energy into electrical energy is the function of generators, while fuses focus solely on circuit protection.