What is the primary role of a power source in a circuit?

The primary role of a power source in a circuit is to supply electrical energy. This is crucial for the operation of electronic devices, as it provides the necessary voltage and current to enable the flow of electricity through the circuit. Without a power source, the circuit would not function, as there would be no energy to drive the components involved.

In different contexts, power sources can include batteries, generators, or mains electricity, all serving the same essential function of delivering electricity to power devices such as lights, motors, and electronics. The role of supplying energy is foundational in understanding how circuits operate—any additional functionalities like amplifying signals or storing energy are typically performed by other components in the circuit.