1. electric circuit, path for transmitting electric current. An electric circuit includes a device that gives energy to the charged particles constituting the current, such as a battery or a generator; devices that use current, such as lamps, electric motors, or computers; and the connecting wires or transmission lines. 1. In a simple circuit, the load is a simple light bulb. Among the four modes of an electronic load, it functions as a constant current that limits and regulates the output of the power supply into a particular level. As a consumer, electronic loads play a crucial role in the healthy function of a circuit to avoid a short circuit.