What force is responsible for causing current to flow through a system of wires?

Voltage is the driving force that causes current to flow through a system of wires. It can be thought of as the electrical pressure or potential difference that pushes electrons through the conductive path of the wires. When voltage is applied across a circuit, it creates an electric field that prompts charge carriers (usually electrons) to move, resulting in the flow of current.

Resistance, while it affects the amount of current that flows for a given voltage (according to Ohm's Law), does not initiate the flow by itself. Capacitance refers to the ability of a system to store charge, which does not directly cause current to flow but rather impacts how current behaves in a circuit over time. Current, on the other hand, is the flow of electric charge itself but is a result of the presence of voltage rather than a force that initiates flow.