What is the primary purpose of a fuse in an electrical circuit?

The primary purpose of a fuse in an electrical circuit is indeed to prevent fires and protect devices. Fuses are designed to act as safety devices that interrupt the flow of electrical current when it exceeds a certain threshold. This action is critical in preventing overheating of wires and appliances, which can lead to electrical fires and damage to electrical components.

When too much current flows through a circuit, the fuse’s metal strip heats up due to the resistance and eventually melts, breaking the circuit. This protective mechanism ensures that excessive current does not reach sensitive electrical devices, thus preserving their functionality and longevity. By preventing overheating and potential damage, fuses play an essential role in maintaining safety within electrical systems.