Question

The plot of the variation of potential difference across a combination of three identical cells in series, versus current is shown below. What is the emf and internal resistance of each cell?

Answer 1

Potential difference, E = 6/3 = 2 V

Internal resistance, r = \(\frac{E}{I} = \frac{6}{1}\) = 6 ohm

Given, three cells are connected in series,

r' = r/3 = 6/3 = 2 ohm