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

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

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

Decreases in both input & output impedances
Increase 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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