Question

In PN-junction diode the reverse saturation current is ${10}^{-5}$ amp at ${27}^{\circ }C$. The forward current for a voltage of 0.2 volt is

• A. $2037.6\times {10}^{-3}amp$
• B. $203.76\times {10}^{-3}amp$
• C. $20.376\times {10}^{-3}amp$
• D. $2.0376\times {10}^{3}amp$

Answer 1

The correct option is C $20.376\times {10}^{-3}amp$

The forward current $i=i_s\left(e^{ev/kT}-1\right)$

$={10}^{-5}\left[e^{\frac{1.6\times {10}^{-19}\times 0.2}{1.4\times {10}^{-23}\times 300}-1}\right]$

$={10}^{-5}\left[2038.6-1\right]=20.376\times {10}^{-3}A$

Hence,

option $\left(C\right)$ is correct answer.