The external part is the part of system unit which can be seen, include the system case and the power button. And the internal part refers to the things inside the system unit example the motherboard, the expansion slot and disk driver
THE EXTERNAL PARTS
these are the parts that are visible/can be seen. they include the system case and the power buttons
THE INTERNAL PARTS
these are inside the system unit and include the motherboard, the expansion slots, disk drives, power supply, the battery, data buses and cables, and so many others
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label the internal parts of the cpu
There is a wide difference between the internal system unit and the external system unit. The internal system unit is usually mounted on the motherboard inside the computer while the external system unit is independent of the computer like an external drive.
like a short definition
this is one of the parts of system unit
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is the control unit
No. It is not a part of CPU but an external peripheral connected to it.
It sounds like you are asking two different questions. See the links below for "What is the definition of system unit?" and "What is the definition of a motherboard?".
In the SI measurement system, a meter is a "base unit". However, the definition relies on the prior definition of the second.
peripherals