What is the function of a Ground Fault Circuit Interrupter (GFCI)?

A Ground Fault Circuit Interrupter (GFCI) plays a critical role in enhancing electrical safety by monitoring the current flowing through a circuit. Its primary purpose is to quickly disconnect power when it detects an imbalance between the outgoing and incoming current, which can occur when electricity escapes the intended circuit, potentially causing electrical shock.

When a ground fault occurs, the GFCI identifies the difference in current and responds almost instantaneously, cutting off the electrical supply. This prevention of electrical shock is particularly vital in areas where the risk of such occurrences is higher, like bathrooms, kitchens, and outdoor settings, where moisture and conductive materials may be present.

The other options do not accurately describe the function of a GFCI. Regulating voltage levels pertains to devices like voltage regulators, preventing overload is managed by circuit breakers or fuses, and converting AC to DC power is the role of rectifiers. Thus, the focus of a GFCI is specifically on safety by preventing electrical shock.