What is a common effect when a fuse blows in a circuit?

When a fuse blows in a circuit, it serves as a protective device designed to break the circuit and stop the flow of electricity when it detects an overload or short circuit. This action effectively interrupts the current flow, leading to a complete shutdown of power in the circuit protected by that fuse. The role of the fuse is to safeguard both the circuit and connected devices from damage that could be caused by excessive current.

In scenarios where the fuse has blown, no electrical devices or components downstream of the fuse will receive power, thereby rendering them inoperative until the fuse is replaced. This is a critical safety feature that helps prevent potential hazards such as overheating or fire that could result from sustained high current. The other choices do not accurately represent the immediate consequence of a blown fuse; thus, a complete shutdown of power supply is the most accurate outcome in this situation.