This physics video tutorial explains how to calculate the internal resistance of a battery when connected to a load resistor. It explains the difference between the terminal voltage across the resistor and the emf or electromotive force generated by the cell. This video contains examples and practice problem showing how to calculate the terminal voltage and the battery and the internal resistance of the cell. The terminal voltage of a battery decreases when electric current is drawn from the cell. As the current delivered by the battery increases, the terminal voltage decreases. Electric Current In Circuits: https://www.youtube.com/watch?v=r-SCyD7f_zI The Electric Battery: https://www.youtube.com/watch?v=xrf6I_5vX64 Ohm's Law Problems: https://www.youtube.com/watch?v=NxxNu9Cek1E Resistance and Resistivity: https://www.youtube.com/watch?v=PIJTu8z0-_U Resistor Color Code: https://www.youtube.com/watch?v=G1mZutobxDU ______________________________ Electromotive Force of a Battery: https://www.youtube.com/watch?v=k077CwKGiwk Drift Velocity and Current Density: https://www.youtube.com/watch?v=KiTkSZy79cw Potential Difference Between Two Points: https://www.youtube.com/watch?v=vcbkvYDP5a8 Alternating Current Vs Direct Current: https://www.youtube.com/watch?v=ERIToctYUcQ ______________________________ Schematic Diagrams & Symbols: https://www.youtube.com/watch?v=Dl1gFBNa0Ik Open, Closed, and Short Circuits: https://www.youtube.com/watch?v=v5RJf_V0LYA Resistors In Series: https://www.youtube.com/watch?v=9z53qVQjasU Resistors In Parallel: https://www.youtube.com/watch?v=SYrOiQs3X2U Physics PDF Worksheets: https://www.video-tutor.net/physics-basic-introduction.html