Question

The change in current through a junction diode is $1.2mA$ when forward bias voltage is changed by $0.6V$. The dynamic resistance is

• A. $500\Omega$
• B. $300\Omega$
• C. $150\Omega$
• D. $250\Omega$

Answer 1

The correct option is A $500\Omega$

Given - $\Delta V=0.6V;\Delta I=1.2mA=1.2\times {10}^{-3}A$

The dynamic resistance of a junction diode is the ratio of small change in voltage to the small change in current i.e.

$r_d=\frac{\Delta V}{\Delta I}$

Hence $r_d=\frac{0.6}{1.2\times {10}^{-3}}=500\Omega$