Semiconductor Diode Forward Bias | Class 12 Physics Practical | VI Characteristics + Knee Voltage
#semiconductor_diode_forward_bias_class_12 #pn_junction_diode_experiment_class_12 #vi_characteristics_of_diode #class_12_physics_practical_diode #forward_bias_experiment_class_12
#semiconductor_diode_practical #iv_characteristics_forward_bias #class_12_practical_exam_2026
Complete Class 12 Physics Practical Experiment 14: To draw the I-V characteristic curve of a PN junction diode in forward bias and hence find the knee voltage (cutting voltage).
2nd PUC Physics Practicals / Lab Experiments in Kannada: • 2nd PUC Physics Practicals / Lab Experimen...
🎯 Perfect for CBSE, ISC, NEET, JEE & State Board Students | Board Exam 2025-26
📚 Topics Covered:
✅ PN Junction Diode Basics & Symbol
✅ Forward Bias Circuit Diagram
✅ Complete Connections Step-by-Step
✅ How to Identify Diode Terminals (Anode/Cathode)
✅ Taking V-I Readings (Voltage & Current)
✅ Observation Table with Sample Readings
✅ Plotting I-V Characteristic Graph
✅ How to Find Knee Voltage from Graph
📐 Key Formulas & Concepts:
• Knee Voltage (Cut-in Voltage): Voltage at which current increases rapidly
• For Silicon Diode: Knee Voltage ≈ 0.7V
• For Germanium Diode: Knee Voltage ≈ 0.3V
• Forward Bias: P-side → Positive, N-side → Negative
🔬 Apparatus Required:
PN junction diode (Silicon), Battery/Power supply , Rheostat, Voltmeter , Milliammeter, Plug key, Connecting wires, Graph paper
⚡ Circuit Connection:
Battery (+) → Rheostat → Milliammeter → Diode Anode → Diode Cathode → Battery (-)
Voltmeter connected in parallel across diode
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