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Resistance is defined by R = V/I where V is potential difference and I is current.

It is not: change in pd / change in current - which would be the gradient of the curve.

Thus to measure the resistance at a particular pd we simply read off the current at that pd and use the equation above.

The problem stems from the way resistors are introduced before non-ohmic components, and for ohmic components it may appear that the gradient is being used for the resistance.

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14y ago

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