When n cells, each e.m.f E volts and internal resistance r ohms are connected in series, the current I through the external resistor of R ohms is given by the formula:
1
\(I = \frac{E}{{R + \frac{r}{n}}}\)
2
\(I = \frac{E}{{R + n}}\)
3
\(I = \frac{{n \cdot E}}{{R + n \cdot r}}\)
4
\(I = \frac{E}{{r + n \cdot R}}\)