Pennsylvania Esthetician State Board Practice Exam

What is the main function of a circuit breaker in an electrical system?

1. Increase voltage

2. Control current flow

3. Prevent overload

4. Provide resistance

The correct answer is: Prevent overload

The main function of a circuit breaker in an electrical system is to prevent overload situations. Circuit breakers are designed to automatically shut off the flow of electricity when the current exceeds a predetermined level, which protects the wiring and connected devices from damage caused by overheating or fire. This safety mechanism helps to maintain the integrity of the electrical system and ensure safe operation. While controlling current flow and providing a measure of resistance are important aspects of how electrical systems operate, they do not capture the essential purpose of a circuit breaker. The circuit breaker's primary role is centered around safety and protection against overloads, making it crucial in preventing potentially hazardous situations. The options related to increasing voltage or providing resistance do not pertain to the function of a circuit breaker, as these functions are typically associated with different components within electrical systems.