Q. If a zener diode $(V_{Z} = 5\ V\ and\ I_{Z} = 10\ mA)$ is connected in series with a resistance and 20 V is applied across the combination, then the maximum resistance one can use without spoiling zener action is
A) $20\ k\Omega$
B) $15\ k\Omega$
C) $10\ k\Omega$
D) $1.5\ k\Omega$
Explanation
(d) Voltage available across load resistance
$R = 20 - 5 = 15\ V$
Resistance of load,
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$R = \frac{15}{10 \times 10^{- 3}} = 1.5 \times 10^{3}$
$= 1.5\ k\Omega$
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.