Analog Electronics
The AC base voltage of an emitter follower is across the

 emitter diode.
 DC emitter resistor.
 load resistor.
  emitter diode and external AC emitter resistance.

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Analog Electronics
A working diode must have

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

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