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A zener diode, having breakdown voltage ...

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

A

10mA

B

15mA

C

20 mA

D

5mA

Text Solution

Verified by Experts

The correct Answer is:
D
Refer to Fig.
Current in Arm CD is `I_(1)=(15 "volt")/(1 kOmega)=15 mA`
Current in arm AB
`I=((20-15)V)/(250Omega)=(5V)/(250Omega)=1/50A`
`=20xx10^(-3)A=20 mA`
Current through zener diode `=I-I_(1)=20-15`
`=5 mA`
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