What is the role of a fuse in an electrical system?

The primary role of a fuse in an electrical system is to protect circuits by breaking the connection in case of overload. A fuse is designed to allow a certain amount of electrical current to flow through it under normal conditions, but if the current exceeds a safe level—often due to a short circuit or equipment failure—the fuse will melt and break the circuit. This interruption prevents excessive current from causing overheating, potential fire hazards, or damage to electrical components.

By serving as a safety device, a fuse helps to ensure that the electrical system operates within safe limits. When the fuse blows, it protects both the wiring and the devices connected to the circuit from the dangers of overcurrent. This protective function is critical in maintaining the integrity and safety of electrical systems. Other options presented, such as supplying additional power, increasing voltage, or regulating current flow, do not accurately reflect the purpose of a fuse.