physics investigatory project on working of zener diode
TRANSCRIPT
Part of Made in India,Design Innovation
Workshop,2015
A Fresh New Experience in Project-‐Making & Learning!
PHYSICS INVESTIGATORY PROJECT ON
WORKING OF ZENER DIODE
Do you know that there are special diodes that conduct even in reverse bias mode? These diodes are called the zener diodes which can be used as voltage regulators, shunt regulators and surge protectors to limit the transient voltage spikes. You can test out its func?oning in forward and reverse-‐bias modes.
This project is divided into two phases. In the first phase, you will need a breadboard, zener diode, an LED, a resistor, a mul?meter and a few connec?ng wires. The orange side of the zener diode is its p-‐side and black stripe represents its n-‐side. The connec?ons are much such that the posi?ve terminal of the LED is connected to the n-‐side of the diode. On the comple?on of the circuit the LED glows. The voltage across the zener diode was measured. It was observed that the diode needs a minimum of 0.79V to allow the current to pass through it.
When the connec?ons of the zener diode were reversed, the LED s?ll glows. The voltage across the zener diode was measured. It was observed that the diode needs a minimum of 5.6V to conduct in reverse biased condi?on. This voltage is known as breakdown voltage.
In the second phase, you will need a preset, a zener diode, an LED, a resistor and a few connec?ng wires. A voltage divider circuit was made using a preset and the connec?ons of the zener diode were s?ll reversed. The preset was rotated ?ll the point where the LED stops glowing and the voltage across the zener diode was measured. The same process was repeated by rota?ng the preset to the point where the LED starts glowing. The breakdown value is printed in the zener diode, the diode used is of value 5V6 (i.e. 5.6V).
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You may also refer to the video: Introduc>on to Zener DiodeV-‐I Characteris>cs of Zener Diode
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