physics investigatory project on functioning of diode and its v-i characteristics
Post on 13-Aug-2015
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Part of Made in India,Design Innovation
Workshop,2015
A Fresh New Experience in Project-‐Making & Learning!
PHYSICS INVESTIGATORY PROJECT ON
FUNCTIONING OF DIODE AND ITS V-I CHARACTERISTICS
Do you know how mul,purpose an ordinary p-‐n junc,on diode is? It is used for power rec,fica,on (changing AC into DC), as an electrical switch, and surge protec,on etc. You can test out its func,oning in forward and reverse-‐bias modes, measure its forward bias voltage and vary current through it to study V-‐I characteris,cs.
This project is divided into two phases. In the first phase, you will need a diode, an LED, a resistor and a few connec,ng wires. The black side of the diode represents its p-‐side and its silver stripe is the n-‐side. The connec,ons were made such that the n-‐side of the diode was connected to the posi,ve terminal of the LED. AJer the comple,on of the circuit, the LED glows. The voltage was measured across the diode using a mul,meter. However, when the connec,ons of the
diode were reversed i.e., when the p-‐side of the diode is connected to the posi,ve terminal of the LED, the LED stopped glowing. It was also observed that a diode needs a minimum forward bias voltage of 0.6-‐0.7 V to allow the current to pass through it.
In the second phase, you will need a preset, a diode, a resistor and a few connec,ng wires. A voltage divider circuit was made using a preset. Using the voltage divider, different input voltages were given to the circuit. At each input voltage, the voltage across the diode and the current passing through it were measured using a mul,meter. Five different voltage and current readings were noted and a graph was ploRed between V and I to study V-‐I characteris,cs of the diode.
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