Analog Electronics
To prevent a DC return between source and load, it is necessary to use

Capacitor between source and load
Resistor between source and load
Either A or B
Inductor between source and load

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Analog Electronics
For an NPN transistor in normal bias

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

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