Analog Electronics
The leakage electric current of a pn junction is caused by

  chemical energy.
  barrier potential.
  heat energy.
  majority carriers.

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Analog Electronics
Optocouplers combine

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

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