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  4. A Zener diode having break down voltage V Z=6 mathrm~V is used in a voltage regulator circuit as shown in the figure. The minimum current required to pass through the Zener to act as a voltage regulator is 10 mathrm~mA and maximum allowed current through Zener is 40 mathrm~mA. The maximum value of RS for Zener to act as a voltage regulator is<img class=img-fluid question-image alt=image src=https://cdn.tardigrade.in/img/question/physics/c8842c5bd8af77412f5be528b7d7c63e-.png />

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Q. A Zener diode having break down voltage $V Z=6 \mathrm{~V}$ is used in a voltage regulator circuit as shown in the figure. The minimum current required to pass through the Zener to act as a voltage regulator is $10 \mathrm{~mA}$ and maximum allowed current through Zener is $40 \mathrm{~mA}$. The maximum value of $R_S$ for Zener to act as a voltage regulator isimage

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Solution:

image
Minimum current $=10\,mA\left(I_L=0\right) R_S=\frac{V}{I}=\frac{4 V}{10 \,mA}=400\, \Omega$