What does a fuse do in an electrical circuit?

A fuse plays a critical role in protecting an electrical circuit by acting as a safety device designed to prevent damage from excessive current flow. The primary function of a fuse is to melt and break the circuit when the current exceeds a predetermined level. This melting occurs due to the heat generated by the increased current, which causes the material of the fuse to reach its melting point. Once the fuse melts, it interrupts the flow of electricity, effectively protecting other components in the circuit from potential damage caused by overheating or electrical fires.

By limiting the current that can pass through the circuit, a fuse helps maintain the safety and integrity of the electrical system. It is important that this protective measure is in place, as it allows for the rest of the system to operate normally without the risk of short circuits or overloads that could lead to catastrophic failures.