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

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

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Analog Electronics
The common-source JFET amplifier has

  a high input impedance and a very high voltage gain.
  a very high input impedance and a relatively low voltage
  no voltage gain.
  a high input impedance and a voltage gain less than 1.

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