Aground fault circuit interrupter (gfci) works by comparing the amount of current going to and returning from equipment along the circuit conductors. when the amount going differs from the amount returning by approximately 5 milliamps, what does the gfci do?

The ground-fault circuit interrupter, or GFCI, is a fast-acting circuit breaker designed to shut off electric power in the event of a ground-fault within as little as 1/40 of a second. It works by comparing the amount of current going to and returning from equipment along the circuit conductors.