In a closed circuit, what is the primary function of the power source?

The primary function of the power source in a closed circuit is to provide a flow of current. In an electrical circuit, the power source creates a potential difference (voltage) that drives the movement of electrical charges through the circuit. This flow of current is essential for powering devices and enabling them to function.

When a power source, such as a battery or power supply, is connected in a circuit, it establishes an electric field that propels electrons from the negative terminal to the positive terminal, effectively creating a current flow. This current is what allows electrical devices to operate, whether it is turning on a light bulb, powering a motor, or supplying energy to any other electronic components.

In contrast, the other options refer to characteristics or functions that are not primarily associated with the power source itself. Reducing resistance, increasing capacitance, or storing energy are aspects of circuit design or component functionality rather than the direct role of the power source in providing the necessary energy flow for current to circulate within the circuit.