What is one example of a load that can be connected to a circuit?

The correct choice is a relay, as it functions as an electrically operated switch that allows a low-power circuit to control a higher power circuit. Relays are specifically designed to act as loads in a circuit by enabling them to switch or control the flow of electrical power, making them integral components in various applications, including automation and control systems. When a voltage is applied to the relay's coil, it activates the electromagnet, which then closes or opens the contacts in the load circuit.

Wires, switches, and sensors serve different primary functions in electrical systems. Wires serve as conductors to carry the electrical current but are not considered loads themselves. Switches control the flow of current within a circuit but do not consume power in the way that a load does. Sensors can detect changes in the environment (like light or temperature) and typically signal or provide input to a control system, but they don't fundamentally act as loads that consume electrical energy.