Just wondering cus like wouldn’t it be more convenient to just plug your phone into the wall without a brick, or like cheaper to build a pc without a power supply? why do these devices need DC but lamps, fridges, fans, most household appliances can run off AC?
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Electrical motor and heaters can run on AC but complex electronics wilt logic circuits can’t.
Monolithic large appliances that just use DC will have the AC to DC converter built in. Som small like LED lamps often convert the power to AC internally.
You could have AC to DC conversion in a phone. The problem is that it significantly increase the size. It is simply more practical to have it externally when it is not needed all the time.
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