"System Unit"
"The electronic components of computers and all the mobile devices which are closed in a case is called System Unit."
But it is notable thing that under this case all the electronic components which are used to process data.
Electronic components of a PC include all the motherboard in which processor,memory, chips, adapter cards(Video card, sound card), power-supply etc are present.
Common examples:
System Unit: CPU, Laptop, Tablet PC, i phones, digital cameras, PDA,
Not system unit: keyboards, mouses, speakers, printers, scanners, USB flash, Monitors, LCDs,
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