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

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

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Analog Electronics
Voltage Series (feedback also called series-shunt feedback) results in

Increase in both input & output impedances
Decreases in both input & output impedances
Decrease in input impedance & increase in output impedance
Increase in input impedance & decreases in output impedance

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