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The \(V-I\)  characteristic of a silicon diode is shown in the figure. Calculate the resistance of the diode at \(I_D=15\mathit{mA}\)  and \(V_0=-10V\)
Question: The  V-I  characteristic of a silicon diode is shown in the figure. Calculate the resistance of the diode at  I_D=15mathit{mA}  and  V_0=-10V

Answer

Considering the diode characteristics as a straight line between \(I=10\mathit{mA}\)  to \(I=20\mathit{mA}\)  passing through the origin. we can calculate the resistance using Ohm's law.
From the curve, at \(I=20\mathit{mA},V=0.8V,1=10\mathit{mA}.V=0.7V\)
\(r_{fb}=\frac{\Delta V}{\Delta I}=\frac{0.1V}{10}\mathit{mA}=10\;\Omega\)
From the curve at \(V=-10V,I=-1\;\mu\text{A}\)
Therefore \(,r_{\mathit{rb}}=\frac{10V}{1\mathit{\mu A}}=1.0\times 10^7\Omega \)
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