Analog Electronics
In a JFET, the primary control on drain electric current is exerted by

  size of depletion regions.
  channel resistance.
  gate reverse bias.
  voltage drop across channel.

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Analog Electronics
For an NPN transistor in normal bias

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

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