What is the purpose of a circuit breaker?

The purpose of a circuit breaker is to protect electrical circuits from overloads or short circuits. Circuit breakers are designed as safety devices that monitor the current flowing through a circuit. When the current exceeds a predetermined limit, which could indicate a potential fault such as an overload or a short circuit, the circuit breaker automatically interrupts the current flow. This action helps to prevent damage to the electrical system, reduces the risk of electrical fires, and ensures safety for both the equipment and the individuals using the system.

In contrast to the correct answer, other options do not accurately reflect the protective function of circuit breakers. Enhancing electrical flow, improving connection stability, or increasing voltage output are not roles played by circuit breakers. Their primary function is focused on safety and protection, making option B the only suitable choice.