How a Transistor Actually Works (No Moving Parts)

Billions of switches with no moving parts: this is how a transistor actually works, from the 1947 Bell Labs invention to the MOSFET inside every modern chip. In this video: 0:00 The switch nobody ever flips 0:32 From relays and vacuum tubes to the transistor 1:32 Silicon, n-type and p-type: how doping works 2:32 The valve analogy: a tiny signal controlling a big flow 3:07 Inside a MOSFET: source, drain, gate and the channel 4:55 From one switch to logic: the NOT gate and the processor 5:51 28 billion transistors on one chip, and the limit of shrinking 6:44 Back to the question + what's next Next video: how these switches become logic gates and then a working processor. This video is an educational simplification. Real transistors are more complex. How it was made: original script and animations. The narration is a synthetic (AI) voice and the music is original. #transistor #electronics #howitworks