Question

If voltage across zener diode is $6V$ then find out value of maximum resistance in this condition.

• A. $2k\Omega$
• B. $6k\Omega$
• C. $5k\Omega$
• D. $4k\Omega$

Answer 1

Answer: (D)

$i=\frac{30}{R+1}mA$
voltage across $1k\Omega =\frac{30}{R+1}\cdot 1=\frac{30}{R+1}=v^2$
$\frac{30}{R+1}=6$
$30=6R+6$
$24+6R\Rightarrow R=\frac{24}{6}4k\Omega$