What force causes current to flow through a system of wires?

Voltage is the correct answer because it represents the electrical potential difference between two points in a circuit. This potential difference is what drives electric current through a system of wires, functioning as the force that pushes charged particles, such as electrons, to move. When a voltage is applied across a conductor, it creates an electric field that influences charge carriers, causing them to flow and generate electrical current.

Resistance is a property that opposes the flow of current, not a force that causes it. Power is the rate at which electrical energy is transferred by an electric circuit, and capacitance is the ability of a system to store an electric charge. While both power and capacitance play roles in electrical systems, they do not directly cause the current to flow; rather, they relate to how current behaves once voltage is applied and how energy is stored or transferred in the system.