Analog Electronics
When a transistor is connected in common emitter mode, it with have

Low input resistance as well as output resistance
Medium input resistance and high output resistance
Negligible input resistance and high output resistance
High input resistance and low output resistance

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Analog Electronics
For an NPN transistor in normal bias

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

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