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According to this and other similar papers, http://www.nature.com/nature/journal/v352/n6337/abs/352699a0.html, adding a current-carrying path can increase the voltage drop across a circuit. What is the simplest example of a circuit (preferably consisting solely of two-terminal devices) that exhibits such behavior?

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You might want to try a Wheatstone bridge type of circuit with two non-linear elements. –  Johannes Dec 8 '12 at 7:29
    
@Johannes what kind of non-linear elements are you talking about? –  Vincent Tjeng Dec 9 '12 at 6:13
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Have a look at this paper: rockefeller.edu/labheads/cohenje/PDFs/… –  Johannes Dec 9 '12 at 12:57
    
thanks, exactly what I was looking for! I was wondering whether it was possible to construct such a circuit using only (ohmic) resistors, but I guess it's not possible. –  Vincent Tjeng Dec 10 '12 at 10:49
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