Analog Electronics
In a JFET, the primary control on drain electric current is exerted by

  gate reverse bias.
  size of depletion regions.
  channel resistance.
  voltage drop across channel.

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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
Increase in input impedance & decreases in output impedance
Decrease in input impedance & increase in output impedance

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