What is the primary function of a fuse in electrical circuits?

The primary function of a fuse in electrical circuits is to interrupt the flow of electrical current when overloaded. Fuses are designed as safety devices that protect electrical systems by breaking the circuit when the current exceeds safe levels. This prevents overheating, electrical fires, and damage to appliances and wiring caused by excessive current.

When the current flowing through a fuse exceeds its rated capacity, the fuse element melts or breaks, effectively halting the flow of electricity. This action safeguards not only the circuit components but also enhances safety for users by preventing potential hazards associated with electrical malfunctions.

The other options represent functions that do not accurately describe what a fuse does. For instance, a fuse does not increase current flow, store energy, or convert energy into light. Instead, its sole purpose is to act as a protective measure in electrical circuits, making it a critical component for maintaining safety and functionality in electrical systems.