What is the primary function of a power supply?

The primary function of a power supply is to provide electrical energy to a circuit. This is fundamental to any electrical or electronic system because, without a power supply, there would be no energy source to drive the components within the circuit. A power supply converts energy from a source, such as an electrical grid, batteries, or solar panels, and provides it in the correct form (voltage and current) needed for the devices it powers.

In practical applications, a power supply might also include features such as voltage regulation to ensure consistent power delivery, but its core responsibility remains to ensure that sufficient electrical energy is supplied to the circuit for operation. Understanding this concept is critical for any aspiring electrician or electrical technician, as it lays the foundation for working with various electrical systems in both residential and industrial settings.