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  4. The V-I characteristic of a silicon diode is shown in figure. The resistance of the diode at ID = 15 mA is <img class=img-fluid question-image alt=image src=https://cdn.tardigrade.in/img/question/physics/cf37e8c4470731b56bd52603bf090dde-.png />

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Q. The $V-I$ characteristic of a silicon diode is shown in figure. The resistance of the diode at $I_D = 15 \,mA$ is
image

Semiconductor Electronics: Materials Devices and Simple Circuits

Solution:

image
In diagram, At $I = 20\, mA, V = 0.8 \,V$ and
At $I = 10 \,mA, V = 0.7\, V$
$r_{fb} = \frac{\Delta V}{\Delta I} = \frac{0.1 V}{10 mA} $
$= 10\Omega$