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Average AC resistance and dynamic resistance are ____________

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Average AC resistance and dynamic resistance are ____________

(a) Always Equal

(b) Never equal

(c) Both represents same quantity

(d) Calculated from V-I graph

I got this question during an interview.

This interesting question is from Resistance Level topic in chapter Diode Circuit of Analog Circuits

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The correct answer is (d) Calculated from V-I graph

The explanation is: Average AC resistance and dynamic or AC resistance are not exactly the same. They both measure the resistance in different ways. AC resistance is slope of the tangent of the curve of characteristic graph at Q-point. But average AC resistance is measured by measuring the slope of straight line between the limits of operation.

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