12th Physics ch2 important 3 Mark | Internal Resistance using Voltmeter | Simple Derivation

In this video, we will learn how to determine the Internal Resistance of a Cell using a Voltmeter in a very simple and easy way. This is an important 3 mark question from 12th Physics Chapter 2. ✅ EMF and Terminal Voltage explained ✅ Why potential drop occurs inside a cell ✅ Derivation of Internal Resistance formula ✅ Circuit diagram explanation ✅ Difference between EMF and terminal potential difference ✅ Important board exam concepts and shortcuts 📘 Perfect for: Tamil Nadu State Board Students CBSE Class 12 Students NEET & JEE Basics Quick revision before exams Formula Used: r=(V/E−V)R Where: E = EMF of the cell V = Terminal voltage R = External resistance r = Internal resistance Hashtags #12thPhysics #InternalResistance #Voltmeter #CurrentElectricity #PhysicsClass12 #BoardExam2026 #PhysicsTamil #CBSEPhysics #TamilNaduStateBoard #NEETPhysics #JEEPhysics #Padidaa #Chapter2