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

The function of a fuse in an electrical circuit is primarily to protect against overcurrent. A fuse is a safety device that contains a metal wire or strip that melts when too much current flows through it. This melting creates an open circuit, which stops the flow of electricity and effectively prevents potential damage to the electrical components in the circuit, such as wires, appliances, or devices connected to it. By interrupting the circuit when an overcurrent condition occurs, a fuse helps prevent fires and equipment damage, ensuring safer operation of electrical systems.

Regulating voltage levels is not a function of a fuse; rather, this task is typically managed by devices such as voltage regulators or transformers. Increasing current flow is contrary to the purpose of a fuse, as its goal is to break the circuit if excessive current is detected, thereby ensuring the flow remains within safe limits. Lastly, measuring electrical resistance is a function performed by ohmmeters or multimeters, not by fuses, which are designed solely to protect circuits from overcurrent situations.