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Ludwik Kowalski wrote:
... r ... was found to decrease
monotonically from 1.4 ohms, at I=0.85 A,
to 1.0 ohms at 3.8A. .... (V1-V2)/I
The question is ill-posed.
In the key formula, V1 is not measured "at"
3.8A so the quotient (V1-V2)/I cannot be called
the resistance "at" (V1-V2)/I.