Electromotive force of a cell is 1.5 V. Its potential difference becomes 1.4 V when 4 A current flows through it. What is the internal resistance of the cell?
Explanation: Remember: E=V+Ir ⇒r=(E−V)/I = (1.5−1.4)/4 =0.025Ω[Ishaque Sir: Edition-2023, Page-207]