A power supply is a device that supplies electrical power to an electrical load. Power supplies are used in a wide variety of applications, from small portable devices such as laptops and cell phones to large industrial machinery.
There are many different types of power supplies, each with its own unique characteristics. The most common type of power supply is the linear power supply. Linear power supplies use a transformer to convert the AC voltage from the wall outlet to a lower DC voltage. The DC voltage is then regulated to provide a constant voltage to the load.