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A cell of emf E and internal resistance ...

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

Text Solution

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Current in circuit `I = (E )/(R+r)` Potential difference across R will be
`V= IR = (ER)/((R +r))`
`V= (E )/((1 + (r )/(R )))`
When `R rarr oo V= E`
`R rarr 0V = 0`
The variation of V vs R is shown in the graph.
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