How many wires are generally involved in a standard 120-volt circuit?

In a standard 120-volt circuit, there are typically two wires involved: a hot wire and a neutral wire. The hot wire carries the electrical current from the power source to the load (such as a light fixture or outlet), while the neutral wire provides a return path for that current back to the power source, completing the circuit. This configuration is essential for the safe operation of electrical devices, as it allows for the safe transfer of electricity.

In addition to these two wires, there is often a ground wire for safety purposes, but it is not counted as part of the basic functioning of a standard 120-volt circuit. Therefore, focusing on just the wires necessary for the circuit's electrical functioning, the correct answer is that two wires are generally involved.