Which statement best describes a neutral wire?

The correct answer highlights that the neutral wire carries current away from the load back to the power source, and typically it is at ground potential. This is a critical function of the neutral wire in an electrical system. In a balanced AC system, the current flows in and out of the load; during this process, the neutral wire completes the electrical circuit by providing a return path for the current back to the transformer or power source.

Furthermore, grounding is essential for safety, as it helps to stabilize the voltage levels and reduce the risk of electric shock. In many electrical systems, particularly in residential wiring, the neutral is bonded to the ground at one point, which helps maintain a zero potential reference.

The other choices do not accurately describe the role of the neutral wire. For instance, while the statement regarding carrying current to the load is true, it specifically pertains to the hot wire, not the neutral wire. Similarly, the job of acting as the primary power supply is the function of the hot wire, and ensuring devices do not overload relates more to circuit protection measures rather than the specific function of the neutral wire itself.