| 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 [AIPMT (M) 2011] |
 |
A) 10 mA
B) 15 mA
C) 20 mA
D) 5 mA
Correct Answer: D
Solution :
 |
| For \[\text{I}\,\text{I}\,\,\text{k}\,\Omega \] |
| \[{{i}_{1}}=\frac{15}{1}=15\,\text{mA}\] |
| For \[\text{I}\,\text{I}\,250\,\Omega \] |
| \[_{i\,\text{250}\,\text{ }\!\!\Omega\!\!\text{ }}\text{=}\frac{20-15}{250}=\frac{5}{250}\] |
| \[=\frac{20}{1000}=20\,mA\] |
| \[\therefore \] \[{{i}_{\text{zener}}}=20-15=5\,mA\] |
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