What is the purpose of ground-fault circuit interrupters (GFCIs) in homes?

The purpose of ground-fault circuit interrupters (GFCIs) in homes is to prevent electric shock by shutting off electrical circuits when a ground fault is detected. GFCIs are designed to monitor the flow of electrical current and can quickly interrupt the circuit if an imbalance occurs, indicating that some current is escaping, possibly through a person's body. This is particularly important in areas where the risk of electric shock is higher, such as kitchens, bathrooms, and outdoor spaces.

The functionality of GFCIs is crucial for safety, as they can react within milliseconds to protect individuals from potentially fatal electrocution. By disconnecting the electrical supply when such a fault is detected, GFCIs serve as a vital protective feature in residential electrical systems, ensuring the safety of occupants.