Which of the following is a common use for circuit breakers?

Circuit breakers serve a critical role in electrical systems primarily by interrupting circuits during a fault. This means that when an electrical fault occurs, such as a short circuit or overload, the circuit breaker automatically disconnects the circuit to prevent damage to the wiring, reduce the risk of fire, and ensure the safety of equipment and individuals. By cutting off the flow of electricity in these scenarios, circuit breakers help protect both the electrical system and connected devices from severe damage that can result from overcurrent conditions.

While some of the other options may relate to electrical systems in some contexts, they do not accurately describe the primary function of circuit breakers. For example, improving energy efficiency pertains more to devices like smart meters and energy management systems, increasing voltage supply refers to transformers or voltage regulators, and storing electrical energy accurately applies to batteries or capacitors. Therefore, interrupting circuits during a fault is the essential and most relevant function of circuit breakers in electrical systems.