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Accurate measurement of the V-I characteristics of a fuel cell allowed the determination of its slope....

Accurate measurement of the V-I characteristics of a fuel cell allowed the determination of its slope. It was found that at 10 A, the slope was -0.003 V/A, but at 5.0 A, the slope was much bigger (in absolute value), -0.005 V/A. Does this make sense? If so, can you calculate the internal resistance of the cell?

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