In residential wiring, what is the purpose of GFCI outlets?

GFCI outlets, or Ground Fault Circuit Interrupters, play a crucial role in residential wiring by preventing ground faults and protecting against electrical shock. The primary function of a GFCI outlet is to monitor the electricity flowing through a circuit. If it detects an imbalance, which indicates that current is leaking, possibly through water or a person's body, it quickly cuts off the electrical supply. This rapid disconnection significantly reduces the risk of severe electrical shock or electrocution, particularly in areas where water and electricity may come into contact, such as kitchens, bathrooms, and outdoor spaces.

The other options do not accurately reflect the primary purpose of GFCI outlets. They do not provide extra power, facilitate the use of high-voltage appliances, or connect different types of circuits. Instead, their design and safety features focus on protecting individuals from the dangers of electric shock in situations where ground faults may occur.