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 ____________

Engineering

Physics

PN Junction Diode

Question

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 _____________ Ω.

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$i = \frac{20}{128 + R_{p}}$

$12 = \frac{20}{128 + R_{p}} \times R_{p}$

1536 = 8R_p

R_p = 192