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CBSE Class 12-science Answered

A resistance R is connected across a cell of emf E and internal resistance r. A potentiometer now measures the pot. diff. btw the terminals of the cell as V. pls explain how.
Asked by Ann Liza Tharakan | 12 Jul, 2013, 07:44: AM
answered-by-expert Expert Answer

The expression is given as

r = [(E - V) / V].R

this comes out because

the total current flowing in a wire is given as

I = IE - IV

or

V/R = E/r - V/r

which can be rearranged to give the above relation

 
Answered by | 12 Jul, 2013, 10:54: AM
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