What is defined as a completed path for voltage to flow from a source through a load and back to the source?

A completed path for voltage to flow from a source through a load and back to the source is known as a closed circuit. In a closed circuit, the electrical pathway is uninterrupted, allowing current to flow smoothly. This flow is essential for powering devices, as electricity travels from the power source, through the load (such as a light bulb or an appliance), and returns to the source, completing the circuit.

In contrast, an open circuit does not allow current to flow because it lacks a complete pathway; this happens when a component is disconnected or there is a break in the circuit. A short circuit occurs when there is an unintended path with very low resistance, often bypassing the load, which can lead to excessive current flow and potentially dangerous situations. The term "load circuit" is not standard; it generally refers to a circuit that includes a load but does not specifically emphasize the completed nature of the path.

The definition of a closed circuit directly addresses the paramount characteristic of an electrical circuit being functional and complete, which is why it is the correct choice.