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by bartl 3341 days ago
People who have studied electrical engineering may recognize the word "dual" with the prototypical example in electrical networks: Norton vs. Thevenin. Both are equivalent but from coming from opposite ends. A current source in parallel with a resistor (Norton) is electrically equivalent to a voltage source in series with a resistor (Thevenin).

(See, for example: https://www.allaboutcircuits.com/textbook/direct-current/chp...)