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CBSE Class 12-science Answered

For the series combination of cells, derive the condition in which the current through externally connected resistance is maximum.

Asked by Topperlearning User | 24 Apr, 2015, 03:36: PM
Expert Answer

Suppose n similar cells each of emf ε and internal resistance r be connected in series. Let R be the external resistance.

Now, the total emf of n cells = sum of all the emfs of n cells = nε
Total internal resistance of n cells in series is = nr
Total resistance of the circuit = R + nr
Hence, total current will be:
Answered by | 24 Apr, 2015, 05:36: PM
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