A power supply is a device that converts other forms of energy into electrical energy and provides electrical energy to circuits (electronic devices).
Power supply is not like a processor, performance can be determined by specifications; The power supply is not like a graphics card, it is determined by a critical GPU to determine the level. A good power supply must not only meet power requirements, but also consider multiple factors such as stability, energy efficiency, quietness, and safety. Without professional equipment for testing, we can only have a clear understanding of the basic principles and component knowledge of power supplies in order to have a clear understanding of them.