Analog Electronics
If the load resistance increases in a zener regulator, the zener current

  Increases.
  decreases.
  equals the source voltage divided by series resistance.
  stays the same.

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Analog Electronics
Optocouplers combine

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

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