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

  zener resistance.
  source.
  zener diode.
  series resistor.

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

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

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