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  • A cell of emf E and internal resistance r is connected across an external resistance R. Plot a graph showing the variation of P.D. across R, verses R.

A cell of emf E and internal resistance r is connected across an external resistance R. Plot a graph showing the variation of P.D. across R, verses R.

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I=\frac{E}{R+r} and V=IR

V=\frac{ER}{R+r}=\frac{E}{1+\frac{r}{}R}

An increase in R leads to an increase in V, till the point it approaches E

Following is the graphical representation:

Posted by

infoexpert24

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