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Although this is a common question, most internet answers are unspecific to VCE and overly complicated.

Could you explain this to me please.

Thank you.

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+1: Well written question. I'm interested to know this myself! – Collin Li Apr 2 at 4:56

1 Answer

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you put a little current through the base, and you can get a lot of current flowing from the collector to the emitter. therefore you can use a small signal (ie output from a chip) to turn on a large current drain (like a motor)

check out Art of Electronics by Horowitz and Hill..

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