Which of the following best describes a GFCI's function?

A Ground Fault Circuit Interrupter (GFCI) is designed to monitor the electrical current flowing through a circuit and ensure that it remains balanced between the outgoing and returning sides. If it detects any imbalance, which indicates that electricity is leaking, often due to a ground fault (like water contact), it will quickly shut off the power to prevent electric shock or fire hazards. This function is crucial in areas where water and electricity are in close proximity, such as kitchens and bathrooms, to enhance safety.

The other options do not accurately describe the core function of a GFCI. While some aspects of electrical systems may involve increasing current or providing additional outlets, these are not the primary roles of a GFCI. Lighting a room is also unrelated to the specific safety function that GFCIs provide, which centers on protection from electrical faults.