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What is the "power supply" in the mainframe?

The power supply in the socket is mains electricity, and the standard voltage is 220V, 50HZ alternating current. All the parts in the computer use direct current, and the computer is relatively low. For example, the voltage of CPU is about 1.3V, and the memory of DDR3 is1.5v. If you plug in 220V of the mains directly, it is estimated that it will smoke immediately. . . So the function of the power supply is to mediate the mains electricity in the socket. Lower blood pressure. Distribute the required voltage and current to the accessories in the computer, so that the computer can work normally.