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  4. A zener diode having zener voltage 8 V and power dissipation rating of 0.5 W is connected across a potential divider arranged with maximum potential drop across zener diode is as shown in the diagram. The value of protective resistance Rp is ....... Ω.

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Q. A zener diode having zener voltage $8\, V$ and power dissipation rating of $0.5\, W$ is connected across a potential divider arranged with maximum potential drop across zener diode is as shown in the diagram. The value of protective resistance $R_{p}$ is ....... $\Omega$.Physics Question Image

JEE MainJEE Main 2021Semiconductor Electronics: Materials Devices and Simple Circuits

Solution:

$P=V i$
$0.5=8 i$
$i=\frac{1}{16} A$
$E=20=8+i R_{P}$
$R_{P}=12 \times 16=192\, \Omega$