What is the purpose of a circuit breaker?

The purpose of a circuit breaker is primarily to prevent electrical fires by interrupting current flow. Circuit breakers are safety devices designed to automatically shut off electrical circuits when they detect an overload or short circuit. By interrupting the flow of electricity, they help protect the electrical system and wiring from overheating and potentially causing fires. This function is crucial in residential settings, as it ensures the safety of both the structure and its occupants by minimizing the risk associated with electrical faults.

While other options such as measuring electrical load, enhancing efficiency, or converting power types are important concepts in electrical systems, they do not accurately describe the primary role of a circuit breaker. Measurement, efficiency enhancement, and power conversion involve different types of devices and principles in electrical engineering. Therefore, the choice focusing on the safety aspect is indeed the correct one.