What is the primary function of a circuit breaker?

The primary function of a circuit breaker is to protect electrical circuits from overload or short circuit conditions. Circuit breakers serve as a safety device designed to interrupt the flow of electricity when it detects an anomaly, such as too much current flowing through a circuit, which could lead to overheating and potentially cause fires or damage to the electrical system.

In the case of an overload, the circuit breaker will trip, cutting off the electrical supply to prevent any further damage. Similarly, in a short circuit scenario, where an unintended path allows current to flow, the breaker will activate to prevent the circuit from experiencing excessive current that it cannot handle. This safety mechanism is crucial in maintaining the integrity of electrical installations and ensuring user safety.

The other options, like increasing voltage, measuring current, or providing ground, do not describe the protective function of a circuit breaker. Instead, they pertain to different components and functionalities found in electrical systems.