Used to protect workmen from electrical shock with tools and extension cords.

• A. G.F.I.
• B. G.C.I.
• C. Circuit Breaker
• D. Surge Protector

Answer: (A)

Ground-fault protection stops shocks by cutting power when current leaks to ground through a person or damaged equipment. A GFI (ground-fault interrupter) or GFCI constantly monitors the current in the hot and the return conductor; if there's any difference due to leakage to ground, it trips almost instantly. This rapid shutoff—often at only a few milliamps of leakage—prevents a dangerous shock when using tools and extension cords in wet or damaged conditions.

Other options serve different purposes: a circuit breaker protects against overloads and short circuits, not specifically a ground fault; a surge protector guards against voltage spikes; GCI is an older term sometimes used interchangeably with GFI but the device remains the same idea. For protecting workers from electrical shock in this scenario, the ground-fault interrupter is the best choice.