What is the main function of a Ground Fault Circuit Interrupter (GFCI)?

The primary function of a Ground Fault Circuit Interrupter (GFCI) is to prevent electrical shock by quickly disconnecting power when it detects a discrepancy between the current flowing in the hot and neutral wires. This situation often indicates that current is leaking to the ground, potentially through a person who may be in contact with the electrical source, which can result in serious harm or fatality. GFCIs are especially crucial in areas where the risk of shock is higher, such as bathrooms, kitchens, and outdoor environments. By interrupting the circuit in milliseconds, the GFCI significantly reduces the likelihood of severe electrical injuries, making it an essential safety device in electrical systems. The correct option emphasizes the GFCI's protective role in ensuring the safety of individuals by minimizing the risk of electrical shock exposure.