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.
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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.
In computers, a unit which delivers information from the computer to an external device or from internal storage to external storage
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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unit of internal resistasnce is ohms too. V = I(R+r) V voltage across the circuit I current in the circuit R external resistance r internal resistance unit of internal resistasnce is ohms too. V = I(R+r) V voltage across the circuit I current in the circuit R external resistance r internal resistance
All this is done by theArthimatical Logical Unit(ALU) in theCPU.
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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.