Question

A Zener diode with a breakdown voltage of $4V$ is connected in series with a resistance $R$ to a battery of emf $10V$ . The maximum power dissipation rating for the Zener diode is $1W$ . The value of $R$ to ensure maximum power dissipation across the diode is

• A. $12\Omega$
• B. $24\Omega$
• C. $36\Omega$
• D. $6\Omega$

Answer 1

Answer: (B)

${\text{P}}_{\text{zener}}=4i=1$
$\Rightarrow i=1/4A$
$i=\frac{6}{R}=\frac{1}{4}$
$\Rightarrow R=24\Omega$