What is the purpose of a fuse in electrical circuits?

The purpose of a fuse in electrical circuits is to melt and interrupt current flow for safety. Fuses are designed to respond to excessive current, which can occur due to overloading or short circuits. When the current flowing through the fuse exceeds a certain threshold, the fuse element heats up and eventually melts, thereby breaking the circuit. This prevents further current from passing through, protecting not only the circuit itself but also the devices connected to it from potential damage due to excess electricity.

This safety mechanism is critical in electrical systems where high current can lead to overheating and potentially cause fires or damage to equipment. The use of fuses is a fundamental aspect of electrical safety, ensuring that circuits are protected against dangerous conditions.