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

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Solution

Since three identical cells are in series.
$\begin{matrix} E m f_{r e s u l t a n t} = e m f_{1} + e m f_{2} + e m f_{3} 6 = 3 e m f \end{matrix}$
is $e m f = 2 V$
$\begin{matrix} R = \frac{V}{I} = \frac{6 V}{1 A} = 6 Ω R e s u l t a n t = R_{1} + R_{2} + R_{3} 6 = 3 R R = 2 Ω \end{matrix}$ \\

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Q. 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 ?

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