Analog Electronics
The AC base voltage of an emitter follower is across the

 emitter diode.
 load resistor.
 DC emitter resistor.
  emitter diode and external AC emitter resistance.

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Analog Electronics
The common-source JFET amplifier has

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

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