Analog Electronics
The load voltage is approximately constant when a zener diode is

  operating in breakdown region.
  reverse biased.
  forward biased.
  unbiased.

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Analog Electronics
For an NPN transistor in normal bias

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

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