What is the function of the power source in an electrical circuit?

The function of the power source in an electrical circuit is to provide a difference of potential, which is essential for current flow. In electrical terms, this difference of potential, also referred to as voltage, is created by the power source, such as a battery or a power supply. The power source establishes an electric field within the circuit, pushing electric charges through the conductive path and enabling the flow of current to power devices or perform work.

This difference in potential is what drives the electrons through the circuit, resulting in the desired operation of connected components such as resistors, capacitors, or devices that utilize electrical energy. By ensuring a voltage is present, the power source enables the entire circuit to function effectively and safely.