Write the equation for the equivalent electromotive force (emf) of a series connection of cells.

(N/A) When $n$ cells,each with electromotive force $E_i$ and internal resistance $r_i$,are connected in series,the total electromotive force $E_{eq}$ is the algebraic sum of the individual electromotive forces of the cells.
The equation for the equivalent emf is given by:
$E_{eq} = E_1 + E_2 + E_3 + ... + E_n = \sum_{i=1}^{n} E_i$
If all cells are identical,each with emf $E$,then the equivalent emf is:
$E_{eq} = nE$