Aviation Computer Based Training (CBT) 2025 – 400 Free Practice Questions to Pass the Exam

The circuit breaker plays a vital role in electrical systems by providing protection against overcurrent conditions, which can occur when there is excess electricity flowing through the circuit. When the current exceeds a predetermined limit, indicating a potential overload or short circuit, the circuit breaker automatically interrupts the flow of electricity. This action helps prevent damage to electrical components and reduces the risk of fire, ensuring the safety and reliability of the electrical system.

In contrast, while voltage regulators maintain a constant voltage level, they do not specifically indicate excess electricity. Similarly, current sensors monitor the flow of electricity but do not disconnect the circuit. Transformers are used to change voltage levels but do not serve a protective function regarding excess current. Thus, the circuit breaker is the correct answer as it directly addresses the need for indicating and managing excess electricity in a circuit.