This video explains the various internal components of a PC.
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Inside a desktop PC it may look like a tangle of wires, especially if you don’t know what you’re seeing. But there’s really a well-organized system in place for delivering power and data from one component to another.
Let's review the basic internal components of the PC.
Inside the PC case, you will find the power supply. You can identify this unit by the fan and the colorful power wires coming from it, and by its connection to the rectangular power plug on the motherboard.
The most important part of a PC is the motherboard, which is the largest circuit board in the PC. The motherboard holds the CPU and memory, and it provides slots and sockets for other components to plug into. Many of the externally accessible ports are also built into the side of the motherboard.
Drive bays hold various types of drives, such as hard disk drives and optical drives like DVD drives. Each drive has two connectors: one to the motherboard and one to the power supply.