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 voltage source
Current controlled Current source

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Analog Electronics
Conventional biasing of a BJT has

  EB reversed biased and CB forward biased.
  EB forward biased and CB forward biased.
  EB forward biased and CB reversed biased.
  EB reversed biased and CB reversed biased.

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Analog Electronics
Optocouplers combine

  Infrared light emitting diode and a silicon photo transistor.
 SITs and BJTs.
 Power transistor and silicon transistor.
 IGBTs and MOSFETs.

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