Question

A Zener diode, having breakdown voltage equal to $15\,V$, is used in a voltage regulator circuit shown in figure. The current through the diode is

• A. 5 mA
• B. 10 mA
• C. 15 mA
• D. 20 mA

Answer 1

Answer: (A)

5 mA

Answer 2

$I _{1}=\frac{15}{1 \,k \,\Omega}=15\, mA$
$I =\frac{20-15}{250}=20 \,mA$
$I _{2}= I - I _{1}=20\, mA -15\, mA =5\, mA$