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
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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.
The common parts of an external system unit include the power supply unit, storage devices (e.g., hard drive or SSD), optical drive (optional), cooling system (fans or liquid cooling), and various ports for connecting peripherals like USB devices, monitors, and network cables.
Internal parts refer to components within the system unit including the motherboard, CPU, RAM, and hard drive. External parts include ports for connecting peripherals (USB, HDMI, Ethernet), optical drives, power button, and cooling fans.
this is one of the parts of system unit
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is the control unit
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?".
No. It is not a part of CPU but an external peripheral connected to it.
In the SI measurement system, a meter is a "base unit". However, the definition relies on the prior definition of the second.
No, the metric system does not use parts as a unit of measurement. In the metric system, the primary unit for length is the meter, which is divided into smaller units such as centimeters and millimeters.