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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AC is basically the biggest strongest athlete you know, UFC/WWE/NFL/etc. DC is like a 5 year old. AC is typically between 120 and 240V, while DC is between 3 and 12V (or less). Put that AC into a DC circuit and its like letting that big-bad athlete fight a 5 year old, it won’t end well for the 5 year old.
Devices with an LED/LCD display, connect to wifi, or are ‘smart’ will all internally convert AC to DC. Simpler devices that are basically just a motor and switch may just be AC.
AC is used because it can be distributed over long distances with little loss. DC is needed more modern electronics, and where storage (a battery) is used.
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