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

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

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Analog Electronics
The arrowhead on the transistor symbol points in the direction of

  conventional electric current flow in the emitter region.
  minority carrier flow in the emitter region.
  majority carrier flow in the emitter region.
  electron flow in the emitter region.

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