Oklahoma Service Technician Practice Exam

The function of a circuit breaker is primarily to protect electrical circuits from overload or short circuits. A circuit breaker acts as a safety device that automatically interrupts the flow of electricity in a circuit when it detects a fault, such as excessive current flow due to an overload or a short circuit. This interruption prevents potential hazards, such as electrical fires or damage to electrical appliances.

When an overload occurs, the circuit breaker trips, disconnecting the power and ensuring that the wiring in the circuit is not damaged by excessive heat. After addressing the issue that caused the overload, the circuit can be restored by manually resetting the breaker.

The other options, while related to electrical systems, represent different functions. Providing electrical power pertains to the role of the power supply or mains. Distributing electricity evenly is a task typically handled by the electrical panel or distribution system, not individual circuit breakers. Converting AC to DC power involves specific devices like rectifiers or power converters, which is unrelated to the protective function of circuit breakers.