Which of the following describes a key function of a ground fault circuit interrupter (GFCI)?

The key function of a ground fault circuit interrupter (GFCI) is to interrupt the circuit in case of ground faults. A GFCI monitors the electrical current flowing through the circuit. If it detects an imbalance—meaning that the current is flowing from the hot wire to ground instead of returning through the neutral—the device automatically shuts off the power. This rapid response (typically within milliseconds) helps prevent electric shock and reduce the risk of electrical fires caused by ground faults.

GFCIs are critical for safety in locations where electrical circuits may be exposed to moisture, such as kitchens, bathrooms, or outdoor areas, where the likelihood of grounding issues is increased. By performing this protective function, GFCIs play a vital role in safeguarding both people and equipment from electrical hazards.