What three voltages do power supplies typically provide to the various components inside a computer?

The power supply usually provides three voltages to various components inside the computer: 1. 5V, mainly supplied to the motherboard; 2. 3.3V, mainly supplied to the CPU; 3. Positive and negative 12V, mainly supplied to the audio circuit. Powered by hard drive. Computers are weak current products, and the working voltage of the components is relatively low, generally DC within plus or minus 12 volts.

The operating environment of this tutorial: Windows 7 system, Dell G3 computer.

The important voltages provided by the power supply to the computer circuit are:

1, 5V, mainly supplied to the motherboard;

2, 3.3V, mainly supplied to the motherboard CPU power supply;

3, plus or minus 12V, mainly for audio circuits and hard drives.

Computers are weak current products, which means that the working voltage of the components is relatively low, generally within plus or minus 12 volts, and is direct current. Ordinary mains power is 220 volts (110 volts in some countries) alternating current, which cannot be used directly on computer components.

Therefore, computers, like many home appliances, need a power supply section, which is responsible for converting ordinary city power into voltage that the computer can use, and is generally installed inside the computer. The core components of the computer operate at a very low voltage, and because the computer operates at a very high frequency, the power requirements are relatively high. (If you need basic knowledge related to computer programming, you can refer to the Programming Learning channel)

The current power supply of the computer is a switching circuit, which converts ordinary alternating current into direct current, and then controls the voltage through chopping. Output different voltages to computer components such as motherboards, hard drives, and optical drives.

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