Analog Electronics
For an NPN transistor in normal bias

  the emitter junction has high resistance.
  Je is forward biased and Jc is reverse biased.
  only holes cross the collector junction.
  only majority carriers cross the collector junction.

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

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