A zener diode having zener voltage 8V and power dissipation rating...

A zener diode having zener voltage $8V$ and power dissipation rating of $0 . 5W$ 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 _____ $Ω .$

A zener diode having zener voltage 8V and power dissipation rating of 0 . 5W is connected across a potential divider

Correct answer

Step-by-step solution

$P = Vi$

$0 . 5 = 8i$

$i = \dfrac{1}{16}A$

$E = 20 = 8 + i{R}_{P}$

${R}_{P} = 12 \times 16 = 192Ω$

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