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Question

The IV characteristic of a silicon diode is shown in the figure. Calculate the resistance of the diode at Ib=15 mA.


A
10 Ω
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B
20 Ω
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C
30 Ω
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D
50 Ω
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Solution

The correct option is A 10 Ω
Considering the diode characteristics as a straight line between I=10 mA to I=20 mA passing through the origin,

we can calculate the resistance using ohm's law

From the curve at I=20 mAV=0.8 V,
I=10 mAV=0.7 V

Rfb=ΔVΔI

Rfb=0.1 V10 mA

Rfb=10 Ω

Hence, option (A) is correct.
Why this question?

Note: In a IV characteristic curve of a pn junction, the dynamic resistance at any point on the graph is the reciprocal of the slope at that point.


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