A cell of emf 'E' and internal resistance 'r' is connected across a variable load resistor R

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A cell of emf 'E' and internal resistance 'r' is connected across a variable load resistor R. Draw the plots of the terminal voltage V versus (i) R and (ii) the current i. It is found that when R = 4Ω, the current is 1A when R is increased to 9Ω , the current reduces to 0.5 A. Find the values of the emf E and internal resistance r

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Explanation:

Here the terminal voltage, class="img-responsive" loading="lazy" title="terminal voltage"

And the current terminal voltage

According to equation (1) and (2), the graph V vs i and V vs R will be shown by the graphs given below:

terminal voltage

Final Answer:

Hence resistance is 1ohm and voltage is 5V.

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