Analog Electronics
A zener diode

  has a constant voltage in the breakdown region.
  is a battery.
  is forward biased.
  has a barrier potential of 1 V.

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Analog Electronics
For an NPN transistor in normal bias

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

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