What is a circuit breaker used for?

A circuit breaker is primarily used for protection from overload in electrical circuits. Its main function is to automatically interrupt the flow of electricity in the event of an overload or short circuit. This protective mechanism helps prevent damage to wiring, electrical appliances, and reduces the risk of fires that can arise from overheating wires. When the current exceeds a predefined level, the circuit breaker trips and interrupts the electrical flow, allowing for a safer environment.

The other options, while relevant to understanding electrical systems, do not accurately capture the primary purpose of a circuit breaker. For instance, controlling circuit voltage and regulating electrical flow refers more to devices like transformers or rheostats, which modify voltage levels and current flow on demand. Enhancing electrical conductivity typically involves focusing on the materials used in electrical components rather than the safety mechanisms designed to prevent overloads.