A Power Supply is a device that provides the necessary electrical energy to an electric circuit or device. In electronic devices such as computers, it converts the mains electricity into the required voltage and current values to power the hardware. Power supplies can be of different types, such as direct current (DC) and alternating current (AC), and adjust the voltage according to the device’s needs. Power supplies commonly used in computers typically provide energy to the motherboard, processor, hard drive, and other components.