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

A fuse plays a crucial role in protecting an electrical circuit by preventing excessive current. It is designed to break the circuit when the current flowing through it exceeds a predetermined level, thus protecting the wiring and connected devices from damage due to overheating or electrical overload. This is essential because excessive current can lead to short circuits or fires, which pose significant safety hazards.

The fuse contains a metal wire or a strip that melts when the current exceeds the safe limit, effectively interrupting the flow of electricity. This action stops the power supply, allowing for safety and preventing potential damage to appliances and reducing the risk of electrical fires. Understanding this protective measure highlights the importance of fuses in maintaining the integrity and safety of electrical systems.