Analog Electronics
In the second approximation, the total voltage across the zener diode is the sum of the breakdown voltage and the voltage across the

  source.
  zener resistance.
  series resistor.
  zener diode.

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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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