current-electricity Question 18

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 V

E=V+ir

6=4+r

r=2Ω

[CBSE Marking Scheme, 2017]



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