Analog Electronics
The leakage electric current of a pn junction is caused by

  chemical energy.
  heat energy.
  majority carriers.
  barrier potential.

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

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

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