Analog Electronics
The voltage divider biasing circuit is used in amplifiers quite often because it

  reduces the DC base electric current.
  limits the AC signal going to base.
  reduces the cost of the circuit.
  makes the operating point almost independent of β.

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

Decrease in input impedance & increase in output impedance
Decreases in both input & output impedances
Increase in both input & output impedances
Increase in input impedance & decreases in output impedance

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