Modern Physics 6 Question 4
4. The figure represents a voltage regulator circuit using a Zener diode. The breakdown voltage of the Zener diode is and the load resistance is . The series resistance of the circuit is . If the battery voltage varies from to , what are the minimum and maximum values of the current through Zener diode?
(Main 2019, 10 April II)
(a)
(b)
(c)
(d)
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Solution:
- In given voltage regulator circuit,
Zener breakdown voltage,
So, across
So, current through load resistance is
Now, when
Potential drop across
So, current through
So, current through Zener diode is
Similarly, when
Hence,