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    As USB became the dominant way to connect peripherals to computers, the plugs and sockets became cheap and ubiquitous. Now everything charges via USB.

    USB-A chargers solved the problem that most computerized thingies need DC current but they need it at different voltages. Pre-USB, everything had different wall wart converters. Using USB chargers lets the device negotiate with the wall wart to get the DC voltage it needs. I think that the computer industry thinks that USB-C will replace USB-A, but my belief is that this is wrong. Cheap USB-A chargers are everywhere now and there’s no reason to ever replace them with something else. I think USB-A will last the rest of our lifetimes as the standard “device needs a small amount of DC” charger wall end. Maybe the device end will go to USB-C from the now more common USB micro, but that’s about it.

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