CSLB Class B General Contractor's License Practice Exam

What is the primary purpose of a circuit breaker?

1. Prevent overloads

2. Provide grounding

3. Regulate voltage

4. Control power output

The correct answer is: Prevent overloads

The primary purpose of a circuit breaker is to prevent overloads. When the electrical load on a circuit exceeds the safe limit, the circuit breaker automatically interrupts the flow of electricity. This function is crucial in protecting electrical wiring and devices from damage that may occur due to overheating, which can lead to fires or equipment failure. By tripping at the appropriate threshold, circuit breakers help ensure that circuits operate within their designed capacity, maintaining safety and system integrity. While grounding, voltage regulation, and controlling power output are important aspects of electrical systems, they serve different functions. Grounding provides a safe path for excess electricity to dissipate, preventing shock hazards. Regulating voltage ensures that electrical devices operate efficiently and safely, while controlling power output relates to managing the energy delivered to devices as needed. These functions complement the protective role of a circuit breaker but do not define its primary purpose.