Plot a graph showing variation of voltage Vs the current drawn from th – InterviewSolution

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1.

Plot a graph showing variation of voltage Vs the current drawn from the cell. How can one get information from this plot about the emf of the cell and its internal resistance?

Answer»

V = ∈ - Ir \(\Rightarrow\) r = \(\frac{\epsilon\,-\,V}{I}\)

At I = 0, V = ∈

When V = 0, I = I0, r = \(\frac{\epsilon}{I_0}\)

The intercept on y-axis gives the emf of the cell. The slope of graph gives the internal resistance.

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