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Thevenin's theorem replaces a complicated circuit facing a load by an

  • A.ideal voltage source and parallel resistor
  • B.ideal current source and parallel resistor
  • C.ideal current source and series resistor
  • D.ideal voltage source and series resistor

Answer: D

Thevenin's theorem replaces a complicated linear network, as seen from the load terminals, by an ideal voltage source (the open-circuit voltage) in series with a single resistance (the resistance looking back into the network with the sources deactivated). That is option D. The parallel combination of an ideal current source and a resistor is the Norton equivalent, which is why options A and B, with a parallel resistor, and option C, with a current source, are wrong for Thevenin's theorem.

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