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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DC is easier to work with. Most “fine detail” electronics have an AC-to-DC transformer either inside them or in a separate power supply. As for convenience, there are USB wall sockets available for USB powered devices. PC power supplies aren’t sufficiently standardised to replace them that way.
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