The following diagram shows a Zener diode as a voltage regulator. The Zener diode is rated at 
and the desired current in load is 5 mA . The unregulated voltage source can supply upto 25 V . Considering the Zener diode can withstand four times of the load current, the value of resistor 
(shown in circuit) should be 
.
Text Solution
Verified by ExpertsD
When the load is disconnected ( 
), the entire current flows through the Zener diode. To protect the diode, we must limit the current to its maximum allowable value:
Voltage across the series resistor:
Using Ohm's law:
──────────────────────────────────────────────────────────────────────────────────────────
Prepare Smarter with CGP Edu
Get practice questions, solutions, and test series in one place.
Write a Review
Share your experience with this question and solution.
Commentary
Send your comment, doubt, correction, or feedback to admin.
Similar Questions
Explore conceptually related problems