The i-V characteristic of a P-N junction diod | vedclass

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Question

(B) The dynamic resistance $R$ is defined as the ratio of the change in voltage to the change in current,given by $R = \frac{\Delta V}{\Delta i}$.From

Vedclass · Accepted Answer

$0.25$

Vedclass · Answer

(B) The dynamic resistance $R$ is defined as the ratio of the change in voltage to the change in current,given by $R = \frac{\Delta V}{\Delta i}$.From the given graph,at $V_1 = 2 \; V$,the current is $i_1 = 400 \; mA = 0.4 \; A$.At $V_2 = 2.1 \; V$,the current is $i_2 = 800 \; mA = 0.8 \; A$.Calculating the changes:$\Delta V = V_2 - V_1 = 2.1 \; V - 2.0 \; V = 0.1 \; V$$\Delta i = i_2 - i_1 = 800 \; mA - 400 \; mA = 400 \; mA = 0.4 \; A$Therefore,the dynamic resistance is:$R = \frac{0.1 \; V}{0.4 \; A} = 0.25 \; \Omega$.Thus,the correct option is $B$.

The $i-V$ characteristic of a $P-N$ junction diode is shown in the figure. The approximate dynamic resistance of the $P-N$ junction when a forward bias of $2 \; V$ is applied is ....... $\Omega$.

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