What is a common reason for using fuses in a circuit?

Using fuses in a circuit primarily serves the purpose of protecting against overloads. Fuses are designed to interrupt the flow of electricity when the current exceeds a certain level, which helps prevent damage to the wiring and connected devices. This overload protection is critical because excessive current can lead to overheating, potential fires, and damage to electrical components.

Fuses are a simple yet effective safety device; when they detect a current higher than their rated capacity, they melt and break the circuit, stopping the flow of electricity. This action protects not only the circuit itself but also helps in safeguarding appliances and reducing the risk of electrical hazards.

While other options like increasing efficiency or regulating current flow involve different mechanisms and components, they do not accurately describe the primary function of a fuse. Similarly, converting AC to DC involves rectifiers rather than fuses, further emphasizing the specific role of fuses in electrical safety.