電源是一種能夠持續供電的設備，其核心功能是將其他形式的能量（如機械能、化學能、熱能等）轉化為電能。常見的電源有干電池（直流電）和家用的110V-220V交流電源。在現代電子系統中，電源起著至關重要的作用，相當于人體的心臟，源源不斷地為電器設備提供動力。Power                  supply is a kind of equipment which can supply electricity continuously. Its core function is to convert other forms of energy (such as mechanical energy, chemical energy, thermal energy, etc.) into electric energy. Common power sources are dry cells (DC) and household 110V-220V AC power. In modern electronic system, power supply plays a vital role, equivalent to the heart of the human body, to continue to provide power for electrical equipment。