Resistivity & Resistance per Unit Length of a Wire | Class 12 PU Board Physics Lab Experiment

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In this video, we perform and explain the *Class 12 PU Board Physics Lab Experiment* to determine the *resistivity of the material of a given wire* and its **resistance per unit length**.

This experiment is prescribed as per the *Karnataka PU Board (PUC) Physics Practical syllabus* and is very important for **lab exams, record writing, and viva preparation**.

📚 Aim of the Experiment:
• To determine the *resistivity (ρ)* of the material of a given wire
• To find the *resistance per unit length* of the wire

🧪 Apparatus Used:
• Given wire
• Metre scale
• Screw gauge
• Ammeter and voltmeter
• Rheostat
• Key and connecting wires
• DC power supply

📐 Theory Covered:
• Ohm’s Law
• Relation between resistance and length
• Formula:
*R = ρl / A*
• Resistivity of a conductor
• Resistance per unit length (R / l)

🧮 Procedure Explained:
• Measurement of length and diameter of the wire
• Calculation of area of cross-section
• Observation of current and voltage
• Graphical and calculation method
• Final result and unit analysis

📌 Additional Inclusions:
• Observation table format
• Formula derivation
• Precautions to be taken
• Sources of error
• Viva-voce questions and answers

🎯 Ideal for:
• Class 12 PUC Physics students
• PU Board practical exam preparation
• Record writing and viva revision
• Teachers and lab instructors

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