Physics Investigatory Project Report

Physics Investigatory Project “Voltage Regulator Using Zener Diode” Diode” Name:G. Ananthakrishna Ananthakrishna Class: XII-A Roll No.: School:Kendriya School:Kendriya Vidyalaya AFS Begumpet Guide Teacher:Mr. Teacher:Mr. T. Srinivasa Rao

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Certificate This is to certify that G.Ananthakrishna, student of Class XII,Kendriya Vidyalaya AFS Begumpet has completed the project titled “Voltage Regulator Using Zener Diode” during the academic year 2016-2017 towards partial fulfillment of credit for the Computer Science practical evaluation of AISSCE 2017, and submitted satisfactory report, as compiled in the following pages, under my supervision.

Mr. T. Srinivasa Rao

(PGT Physics)

External Examiner

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Acknowledgement I thank Mr. T. Srinivasa Rao for his constant support and encouragement towards the completion of this project.I also thank my principal Mr. A.A. Israel and my parents for their support.

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INDEX

Certificate

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Acknowledgement

3

AIM

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Apparatus/Components

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Theory

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Procedure

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Observations

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Result

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References

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AIM

“To Construct a Voltage Regulator Using a Zener Diode”

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Apparatus/Components 1. 2. 3. 4. 5. 6.

5.1V Zener Diode Bread Board 2.7K Resistor Connecting Wires 9V Battery with connector Multimeter/Voltmeter

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Theory Zener Diode: A zener diode is a diode that breaks down at a specific voltage when it is reverse biased. A zener diode can maintain the voltage at its breakdown voltage as long as the supply voltage is above this value.

In Forward Bias: When a zener diode is forward biased it behaves like an ordinary silicon diode. In Reverse Bias: When the zener diode is reverse biased with a voltage less than Vz it blocks the current, like an ordinary silicon diode. When the reverse bias voltage reaches Vz the voltage is limited to around this value, but it can conduct very large currents

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Circuit Diagram:

Here, Input=9V RA=2.7K ohm Zener Diode=5.1V

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Procedure 1. Assemble the above circuit on the bread board. 2. Use a multimeter to verify that the output voltage is equal to the zener voltage. 3. If not check all connections again and make sure the zener diode is in reverse bias. 4. If still the voltage is not correct change the diode. 5. Your Voltage Regulator is ready.

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Observations The Output Voltage is Equal to the Zener Voltage(5.1V) and Hence Voltage has been Regulated.

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Result The Voltage Regulator Has Been Constructed Successfully with output voltage of 5.1V

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References 1. http://www.jaconline.com.au/jacarandaphysics/jacarandaphys ics2/downloads/design-changes/u3-ds3-link-2.pdf (theory) 2. http://www.google.com(images) 3. http://vlab.amrita.edu/?sub=1&brch=282&sim=1207&cnt=1 (theory)