Why do computer chargers need those big adapters? Why can’t you just connect the devices to the power outlet with a cable?
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Like a steam engine, the big piston works by allowing steam in either side alternatingly, pushing the piston arm back and forth. This is similar to how power works, a rhythmic cycle of push/pull.
Like the train wheel, the brick converts the back and forth motion of the pistons into forward motion only, moving the train down the tracks.
In computers, power doesn’t go back and forth, it goes in one direction, like the toy train on a track loop.
So the brick is the piston and wheel, converting the back and forth power of the wall into forward moving power for the ‘train’.
The parts needed to make this happen are bulky and take up room, so they make them a special place outside the computer so the computer can be small and thin for you, and not take up too much space like a big wall plug does.
In a desktop computer it’s inside and they call the special brick a ‘Power Supply Unit’, or PSU for short.
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