Analog Electronics
The output voltage of an emitter follower is across the

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

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Analog Electronics
In an OP-amp differentiator

The amplitude of output is proportional to input
Polarity of input and output is the same
The amplitude of output is proportional to rate of change of input
Output occurs when input is finite and constant

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