EEQ = nEEquivalent internal resistance req = nrParallel grouping:In parallel grouping, all anodes are connected at one point and all cathode are connected together at other points.If n identical cells are connected in parallelEquivalent emf of the combination Eeq = EEquivalent internal resistance req = r/nAnalysis:Batteries or voltage sources added in series give adding emf and in parallel increased current but the same emf.10 V and 10 V are in series GIVING a total of 20 V. 6 V and 6 V are in parallel giving a total of 6 V (emf will not CHANGE). The given circuit can be simplified asHence the resultant POTENTIAL difference between A and B is 14 V.Detailed Concept and Video Solution