What is the function of a circuit breaker?

The function of a circuit breaker is to switch off electric power when the current exceeds capacity. This mechanism is crucial for protecting electrical circuits from damage caused by overloads or short circuits. When the electrical current flowing through the circuit surpasses the safe limit, the circuit breaker automatically interrupts the flow of electricity, preventing potential hazards like overheating or fire. By doing so, it ensures the safety of both the electrical system and the people using it.

In contrast, the other options describe functions that do not align with what a circuit breaker does. Increasing electrical flow relates to devices like transformers or amplifiers, which are designed to enhance voltage or current. Amplifying sound pertains to audio equipment rather than electrical protection devices. Serving as a voltage regulator is another distinct function that involves maintaining a constant voltage level, typically achieved by different types of electrical components dedicated to voltage regulation.