Analog Electronics
In a normally biased npn transistor, the electrons in the emitter have enough energy to overcome the barrier potential of the

 collector - base junction.
 base - collector junction.
 recombination path.
  base - emitter junction.

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Analog Electronics
A working diode must have

 High resistance when forward biased, while low resistance when reverse bias
 Low resistance when forward or reverse biased
 High resistance when forward or reverse biased
 Low resistance when forward biased, while high resistance when reverse bias

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