Question: Q. 5. The figure shows a plot of terminal voltage ’ $V$ ’ versus the current ’ $i$ ’ of a given cell. Calculate from the graph (i) emf of the cell and (ii) internal resistance of the cell.

U] [O.D. Comptt. I, II, III 2017]

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Solution:

Ans. Emf of cell

Internal resistance

(ii)

$E=V$ for $I=0$

$E=6 \mathrm{~V}$

$E=V+i r$

$6=4+r$

$r=2 \Omega$

[CBSE Marking Scheme, 2017]



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