When n-p-n transistor is used as an amplifier | vedclass

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(A) In an $n-p-n$ transistor, the emitter is $n$-type, the base is $p$-type, and the collector is $n$-type.When used as an amplifier, the base-emitter

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electrons move from base to collector

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(A) In an $n-p-n$ transistor, the emitter is $n$-type, the base is $p$-type, and the collector is $n$-type.When used as an amplifier, the base-emitter junction is forward-biased and the base-collector junction is reverse-biased.Due to the forward bias, electrons are injected from the $n$-type emitter into the $p$-type base.Because the base is very thin and lightly doped, most of these electrons diffuse through the base into the collector region.The collector is kept at a positive potential relative to the base, which attracts these electrons from the base to the collector.Therefore, electrons move from the base to the collector.

When $n-p-n$ transistor is used as an amplifier :

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