Analog Electronics
The action of JFET in its equivalent circuit can best be represented as a

Voltage controlled voltage source
voltage controlled current source
Current controlled Current source
Current controlled voltage source

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Analog Electronics
For an NPN transistor in normal bias

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

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