Why are power supplies so complex?

Just a silly question from an ME.

Why are ordinary DC power supplies so complicated? What's going on in
there that seems to take so many components and makes them so big and
expensive? It seems to me that you would just need to transform the
voltage down, rectify it, and filter it to DC. What does all the rest
of that stuff do? Thanks for any replies.

Don
Kansas City

.

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