Which type of circuit refers to one allowing current to return to the power source?

A closed circuit is one that provides a complete path for current to flow from the power source, through the components of the circuit, and back to the power source. In a closed circuit, the connections are intact, allowing for the continuous movement of electrical charge, which enables devices, like light bulbs or motors, to function.

In contrast, an open circuit breaks this path, interrupting the flow of current and thus preventing any devices connected in the circuit from operating. A complex circuit involves multiple components and pathways for current but does not specifically define the criteria for current returning to the power source. A static circuit generally refers to systems where charges may accumulate without flow, rather than emphasizing the current flow back to the source. Thus, the identification of a closed circuit confirms its role in facilitating the return of current to the power source.