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AC resistance of a diode was found to be r1 and r2, when measured with two different values of diode current i.e. 10 mA and 25 mA respectively, for the same diode voltage. Which of the following options hold true?

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AC resistance of a diode was found to be r1 and r2, when measured with two different values of diode current i.e. 10 mA and 25 mA respectively, for the same diode voltage. Which of the following options hold true?

(a) r1 = r2

(b) r1 > r2

(c) r1 < r2

(d) Can’t be determined

The question was asked in examination.

This interesting question is from Diode Basics and Equivalent Circuits in division Diode Circuit of Analog Circuits

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The correct option is (b) r1 > r2

The best I can explain: r1 > r2 as AC resistance is inversely proportional to the diode current.

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