GFCI stands for which protective device?

• A. Ground Fault Current Indicator
• B. Grounded Fire Circuit Interface
• C. Ground Fault Circuit Interrupter
• D. Generator Fuel Control Interface

Answer: (C)

Ground Fault Circuit Interrupter is a safety device that watches the current flowing in a circuit and looks for an imbalance between the hot and neutral paths. If some current leaks to ground—such as through a person or moisture—the device trips and opens the circuit almost instantly. That rapid shutoff, typically at just a few milliamps of leakage, helps prevent electric shock in environments where contact with energized parts is more likely.

This name reflects its function: it not only detects a ground fault but also interrupts the circuit to stop the dangerous condition. The other options describe things that aren’t protective devices in the same way (an indicator that would only signal a fault, or terms not used for this purpose, or something unrelated to electrical safety).