Analog Electronics
The value of total collector electric current in a CB circuit is

  IC = βIE.
  IC = αIE.
  IC = αIE + ICO.
  IC = αIE - ICO.

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

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