What does a Ground Fault Circuit Interrupter (GFCI) do?

A Ground Fault Circuit Interrupter (GFCI) is designed to enhance electrical safety by monitoring the flow of electricity through a circuit. It detects imbalances in electrical current, which can occur when electrical current is inadvertently flowing through an unintended path, such as through water or a person. This situation can create a dangerous shock hazard.

When the GFCI senses this difference in current, it reacts swiftly by cutting off the electricity supply to the circuit, usually within fractions of a second. This rapid disconnection helps to prevent serious electrical shock or injury. GFCIs are commonly used in areas where water exposure is likely, such as kitchens, bathrooms, and outdoor outlets, making them crucial for ensuring safety in potentially hazardous environments.

Understanding how a GFCI works emphasizes its role in protecting people from electrical injuries by continuously monitoring and responding to abnormal current flows.