Which of the following wires carries current back to the source?

The wire that carries current back to the source is the neutral wire. In a typical electrical circuit, the hot wire provides power from the source to the load, while the neutral wire serves as the return path that allows the current to flow back to the power source. This is essential for completing the circuit and ensuring that electrical devices function properly.

The neutral wire is typically grounded at the service panel, which helps to stabilize voltage levels and provides a safe pathway for stray current. This safety feature is crucial in preventing malfunctions and hazards within the electrical system.

In contrast, the hot wire carries current towards the electrical device, while the switched and traveler wires have specific functions in certain circuit configurations, such as in lighting controls and multi-way switching setups. These do not serve as the primary return path back to the source. A clear understanding of the roles of these different wires is vital for ensuring safe and effective electrical installations.