What does AFCI stand for and what is its primary purpose?

The chosen answer is correct because AFCI stands for Arc-Fault Circuit Interrupter, and its primary purpose is indeed to prevent electrical fires. AFCIs are designed to detect arc faults, which are unintended electrical discharges caused by damaged wires or faulty connections. These arcs can produce high temperatures that may ignite nearby flammable materials, leading to fires. By interrupting the circuit when such faults are detected, AFCIs enhance safety in residential and commercial electrical systems.

The other options refer to terms and functions that do not accurately represent the purpose of an AFCI. While increasing power efficiency, controlling circuit load, and managing voltage levels are important aspects of electrical systems, they are not functions performed by an AFCI. The main focus of AFCIs is fire prevention through arc detection, making option A the appropriate selection.