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How do you calculate battery

SERIES CONNECTION OF BATTERY                 E=e.m.f of one cell, volt                 n=Number of cell.                 r=Internal resistance of one cell, ohms                Total  e.m.f ( E T )= n*E, volt                Total internal resistance (R T ) = n*r ,ohms                Total current (I)= nE/nr+R , ampere PARALLEL CONNECTION OF BATTERY                E=e.m.f of one cell, volt                n=Number of cell.                r=Internal resistance of one cell, ohms                Total  e.m.f ( E T )=E , volt ...