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Graph to show the variation of the p.d. V across the battery with current I as R is varied.

i) Draw line of best fit.

ii) Use it to determine the emf of the battery;

and the internal resistance r of the battery.

The gradient [itex] \approx \frac{\Delta V}{\Delta I} = 1.67 \Omega [/itex]

Just don't know what to do really. Need an example and explanation of the concept.