V – I Characteristics of a PN Junction Diode | 12th Standard Physics Practical | Forward Resistance
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🔋 Explore the fascinating world of semiconductors! In this practical physics experiment for 12th standard students, we learn how to determine the V-I characteristics of a PN junction diode. This step-by-step guide covers both forward bias and reverse bias conditions, along with the calculation of forward resistance.
🔬 In This Video:
✅ Theory of PN Junction Diode
✅ Setting up the V-I characteristics experiment
✅ Drawing the V-I graph for forward and reverse bias
✅ Calculating forward resistance
✅ Tips for accurate practical performance
📘 This is a must-watch for students preparing for board practical exams and looking to strengthen their semiconductor physics concepts.
Aim
To draw the voltage current characteristics of the PN junction diode and to determine its Knee voltage and forward resistance.
Procedure
Forward Bias characteristics
1. The circuit is wired as in the diagram
2. The forward voltage Vf increased from zero insteps of 0.1V upto 1.0 V
3. The corresponding values of If are noted.
4. A graph is drawn with Vf along X axis and If along Y axis.
5. This is called forward characteristic curve.
6. The reciprocal of the slope of this curve above the knee point is found as resistance of the diode.
Reverse Bias characteristics
1. The circuit is wired as in the diagram
2. The reverse voltage VR increased from zero insteps of 1V upto 6 V
3. The corresponding values of IR are noted.
4. A graph is drawn with VR along X axis and IR along Y axis.
5. This is called reverse characteristic curve.
Result
The V – I characteristic of the PN junction diode are studied
Knee voltage of the PN junction diode = V
Forward resistance of the diode = Ω