Analog Electronics
In the second approximation, the total voltage across the zener diode is the sum of the breakdown voltage and the voltage across the

  source.
  zener resistance.
  zener diode.
  series resistor.

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Analog Electronics
The typical input stage of an opamp has a

  single - ended input and single-ended output.
  differential input and differential output.
  single - ended input and differential output.
  differential input and single - ended output.

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