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How do electronics work?

In the design of transistors and microchips, what affects the behaviour and movement of electrons in a semiconductor, conductor, vacuum, or gas?
And how do engineers harness and control this movement?

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Pfuzylogic · M

There are two types of devices that control.
Field Effect transistors which control by fields and transistors such forward bias PN junctions through current
Had to put my two cents in. 😁