What does the presence of a GFCI indicate about a circuit?

The presence of a Ground Fault Circuit Interrupter (GFCI) indicates that the circuit is designed to provide extra security against electrical shock. GFCIs monitor the amount of electrical current flowing from the hot wire to the neutral wire. If they detect an imbalance, which could suggest a ground fault—where current is escaping the intended path—they quickly cut off the power. This functionality significantly reduces the risk of electrical shock, particularly in wet or damp environments, such as bathrooms, kitchens, and outdoor locations.

Other options such as indicating high voltage or requiring a higher amperage supply are not accurate because GFCIs can be used in standard voltage circuits and do not inherently change the amperage required. Additionally, while GFCIs are often found in outdoor applications due to safety reasons, their presence does not exclusively denote that a circuit is intended for outdoor use. Rather, their primary purpose is to enhance safety by preventing potential electrocution.