Analog Electronics
In a common emitter, unbypassed resister provides

negative voltage feedback
current series feedback
voltage shunt feedback
positive current feedback

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Analog Electronics
The ICBO is the electric current that flows when some DC voltage is applied

  in the forward direction to the collector junction with emitter open.
  in the reverse direction to the emitter junction with collector open.
  in the reverse direction to the collector junction with emitter open.
  in the forward direction to the emitter junction with collector open.

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