Journeyman Electrician Practice Exam 2025 – 400 Free Practice Questions to Pass the Exam

The role of circuit breakers in electrical systems is fundamentally to limit current flow. Circuit breakers are designed to interrupt the flow of electricity in a circuit when an overload or a fault is detected, thereby preventing potential damage to the electrical system and reducing the risk of fire. When the current exceeds a certain threshold due to a fault condition, the circuit breaker automatically trips, stopping the flow of electricity and safeguarding both the wiring and connected devices from damage.

This safety function is critical in protecting appliances and preventing hazardous situations. While circuit breakers do not provide a backup power source, connect multiple circuits, or increase electrical resistance, their primary function is to monitor and control the amount of current flowing through a circuit. By doing so, they ensure the system operates within safe limits and offer a reliable means to protect the entire electrical installation.