Question

The current flowing through the Zener diode in the given circuit is

• A. $20\text{mA}$
• B. $25\text{mA}$
• C. $15\text{mA}$
• D. $5\text{mA}$

Answer 1

The correct option is D $5\text{mA}$

Given, the reverse voltage of the Zener diode is $5\text{V}.$



Thus, current through the $500\Omega$ resistance $I_1$ is,

$I_1=\frac{10-5}{500}=0.01\text{A}$

Hence, current through the $1\text{k}\Omega$ resistance $I_2$ is,

$I_2=\frac{5}{1000}=5\times {10}^{-3}\text{A}$

Now, current through Zener diode is,

$I_1-I_2=0.01-0.005=0.005\text{A}=5\text{mA}$

<!--td {border: 1px solid #ccc;}br {mso-data-placement:same-cell;}--> Hence, $\left(D\right)$ is the correct answer.