If a circuit includes a device that interrupts current to prevent damage, what is it called?

If a circuit includes a device that interrupts current to prevent damage, what is it called?

• A. Circuit breaker
• B. Resistor
• C. Circuit switch
• D. Fuse

Answer: (D)

A fuse is a protective device that interrupts current to prevent damage. It contains a metal link that heats up when the current exceeds its rating. If the current gets too high, the link melts and opens the circuit, stopping the flow of electricity and protecting wiring, components, and the device from overheating or fire. After it blows, you replace the fuse, since it’s a one-time protective component. A circuit breaker can also stop current when there’s an overload, but it’s resettable and is designed to be reused after it trips. A resistor is meant to limit current, not automatically cut it off. A circuit switch is just a switch that opens or closes the circuit—it doesn’t provide automatic protection against overload.

A fuse is a protective device that interrupts current to prevent damage. It contains a metal link that heats up when the current exceeds its rating. If the current gets too high, the link melts and opens the circuit, stopping the flow of electricity and protecting wiring, components, and the device from overheating or fire. After it blows, you replace the fuse, since it’s a one-time protective component.

A circuit breaker can also stop current when there’s an overload, but it’s resettable and is designed to be reused after it trips. A resistor is meant to limit current, not automatically cut it off. A circuit switch is just a switch that opens or closes the circuit—it doesn’t provide automatic protection against overload.