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
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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