A.) Combination of cells when emf of cells are same: There are three types of combinations of cells in the circuit 1.) Series Combination of Cells 2.) Parallel Combination of Cells 3.) Mixed Combination of Cells 1.) Series Combination of Cells: Let us consider that the $n$ - cells having emf (electromotive force) $E$ and internal resistance $r$ are connected in series with external resistance $R$. Then from the figure given below The total emf of the $n$ - cell = $nE$ The total internal resistance of the $n$ - cell = $nr$ The total resistance of the circuit = $nr+R$ The total current in the circuit $i=\frac{Total \: emf \: of \: the \: n - series \: cell}{Total \: resistance \: of \: the \: circuit}$ $i=\frac{nE}{nr+R}$ 2.) Parallel Combination of Cells: Let us consider that the $n$ - cells having emf (electromotive force) $E$ and internal resistance $r$ are connected in parallel with external resistance $R$. Then from the figure given below The t

# Physics Vidyapith ✍️

(The Advance Learning Institute of Physics and Technology)