Maintenance Technician Practice Test 2025 – 400 Free Practice Questions to Pass the Exam

The device that is used to control the flow of electricity in a circuit is a circuit breaker. Circuit breakers serve a critical safety function by interrupting the flow of electrical current when it exceeds a predetermined level due to faults such as overloads or short circuits. When the circuit experiences issues, the circuit breaker automatically trips and cuts off the current, preventing potential damage to wiring and connected devices.

This interruption is essential in protecting electrical systems from overheating or causing fires. Unlike fuses, which need to be replaced once blown, circuit breakers can be reset after tripping, making them a more convenient option for managing electrical flow. Although other devices listed have their own functions – such as fuses providing overcurrent protection, transformers altering voltage levels, and capacitors storing electrical energy – circuit breakers are specifically designed for controlling the flow of electricity and enhancing safety in electrical circuits.