What are the advantages of series grouping and parallel grouping?

What are the advantages of series grouping and parallel grouping?
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1 Answer

Answer :

Advantages of series grouping.
a. The total emf increases and is equal to ‘nE’. Where n – total number of cells in series and E – emf of one cell.
b. The internal resistance ‘r’ also increases and equal to ‘nr’. So total resistance of the circuit also increases and is equal to R + nr ohms. Where R – external load resistance.
c. Total current is equal to one cell current. That is there is no current increase. If the internal resistance is negligible or less then current will be maximum.

 Advantages of parallel grouping.
a. In parallel grouping emf of one cell will be the total emf of the grouping.
b. Total internal resistance of the parallel group is equal to r/n.
c. Total resistance of the group is equal to R + r/n.
d. Total current = E / (R +r/n) amps.
So we can understand that parallel useful when the external resistance is small as compared to internal resistance of the parallel group. But at the same time series grouping is useful when the internal resistance is small compared to the external resistance of the group.
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