Analog Electronics
In the second approximation, the total voltage across the zener diode is the sum of the breakdown voltage and the voltage across the

  zener resistance.
  zener diode.
  series resistor.
  source.

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Analog Electronics
For an NPN transistor in normal bias

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

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