What is connected to the green wire in a three-wire electrical AC plug?

In a three-wire electrical AC plug, the green wire is specifically designated as the safety ground. This wire serves a crucial function in electrical systems, as it provides a path for electrical currents to safely dissipate into the ground in case of a fault or failure in the electrical device. By connecting the device's metal parts to the ground via the green wire, the risk of electrical shock is significantly reduced, as it directs any stray current away from users.

The other choices represent different wiring functions in an electrical system. The hot wire, typically black or red, carries the electrical current to the device, while the neutral wire, usually white, provides a return path for that current. Understanding these distinctions is important for using electrical equipment safely and effectively.