Analog Electronics
The power dissipated by a transistor approximately equals the collector current times

 base - emitter voltage.
 base supply voltage.
  collector - emitter voltage.
 0.7 V.

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Analog Electronics
Optocouplers combine

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

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