Red Seal Construction Electrician Practice Exam

What is the function of a circuit breaker?

1. To amplify electrical signals

2. To measure electrical current

3. To interrupt electricity flow in a circuit when an overload or short circuit occurs

4. To stabilize voltage levels in a circuit

The correct answer is: To interrupt electricity flow in a circuit when an overload or short circuit occurs

The function of a circuit breaker is to interrupt electricity flow in a circuit when an overload or short circuit occurs. This safety device is crucial in electrical systems because it protects both the wiring and connected devices from excessive current, which can lead to overheating, fire, or equipment damage. When the current exceeds the safe limit, the circuit breaker trips, effectively disconnecting the power and preventing potential hazards. This immediate response is essential in maintaining the safety and integrity of electrical systems, allowing for safe operation without the risk of electrical failures. In other contexts, amplifying electrical signals, measuring current, or stabilizing voltage may be functions performed by other devices, but they do not pertain to the primary role of a circuit breaker.