What happens when a fuse in a circuit blows?

When a fuse in a circuit blows, it interrupts the flow of electricity, effectively breaking the circuit. This is the intended function of a fuse, which is designed to protect the circuit from overcurrent conditions that could lead to damage or hazard. Once a fuse has blown, the electrical supply is cut off, and the fuse must be replaced to restore the circuit’s functionality. The process of replacing the fuse is crucial for safety and to ensure that the circuit can operate properly again.

The other options do not accurately describe the consequence of a blown fuse. For example, the circuit does not become shorted; instead, it is opened. There is no automatic reset mechanism for fuses; they require manual replacement. Finally, the flow of electricity does change significantly when a fuse blows, as the circuit is no longer complete and cannot carry current until the fuse is replaced. Thus, the necessity to replace the fuse aligns perfectly with the function and purpose of fuses in electrical systems.