What does a circuit breaker interrupt to protect electrical circuits?

A circuit breaker interrupts current flow to protect electrical circuits from overcurrents that can result from faults, overloads, or short circuits. When the current exceeds a predetermined threshold, the circuit breaker automatically opens the circuit, stopping the flow of electricity. This interruption prevents potential damage to wiring, devices, and appliances that could occur due to excessive current, thereby enhancing safety and preventing fire hazards.

In contrast, voltage surges relate to spikes in electrical voltage rather than the flow of current itself. Electrical resistance refers to the opposition within a circuit to current flow and does not directly pertain to the function of a circuit breaker. Power generation encompasses the production of electrical energy, which is not something a circuit breaker interrupts. Thus, the role of a circuit breaker is specifically focused on interrupting current flow to ensure the protection and integrity of electrical systems.