Which device protects a circuit from overload?

Which device protects a circuit from overload?

• A. Breaker
• B. Capacitor
• C. Resistor
• D. Fuse

Answer: (D)

Overcurrent protection works by interrupting current when it exceeds a safe level. A fuse does this by containing a thin metal link that melts when the current is too high, opening the circuit and stopping the flow to prevent wiring damage or fire. It’s a simple, single-use protection device that you must replace after it blows. A circuit breaker can also protect a circuit and is resettable, but in this scenario the fuse is the described protective device. A capacitor stores electrical energy and won’t prevent overload, while a resistor limits current but doesn’t disconnect the circuit when overheating occurs.

Overcurrent protection works by interrupting current when it exceeds a safe level. A fuse does this by containing a thin metal link that melts when the current is too high, opening the circuit and stopping the flow to prevent wiring damage or fire. It’s a simple, single-use protection device that you must replace after it blows. A circuit breaker can also protect a circuit and is resettable, but in this scenario the fuse is the described protective device. A capacitor stores electrical energy and won’t prevent overload, while a resistor limits current but doesn’t disconnect the circuit when overheating occurs.