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MHT-CET : Physics Entrance Exam

MHT - CET : Physics - Current Electricity Know More

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Grouping of Cells

Series Arrangement: If n cells, each of e.m.f. E and internal resistance r, are joined in series, the e.m.f. of the combination equals nE volt. The internal resistance of the combination is nr W.

 

Parallel Arrangement: If n cells, each of e.m.f. E and internal resistance r, are joined in parallel, the e.m.f. of the combination equals E volt. The internal resistance of the combination is r/nW.

 

Mixed Grouping of Cells: If mn cells, each of e.m.f. E and internal resistance r are arranged as follows:


e.m.f. across points AB =
n E volt

Internal resistance of the combination  l = 

nr

m

 

Current supplied to an external resistence R =

mnE

mR + nr

 

In this combination, the current supplied is maximum when

m

n

=

r

R

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