Analog Electronics
For an NPN transistor in normal bias

  Je is forward biased and Jc is reverse biased.
  only majority carriers cross the collector junction.
  the emitter junction has high resistance.
  only holes cross the collector junction.

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Analog Electronics
For transistor action

  the emitter should be heavily doped.
  the base region must be very thin and lightly doped.
  Je must be forward biased and Jc should be reverse biased.
  all of these.

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