Question

1. two identical cells of 9.0 V each are connected in parallel. What is the total voltage? 2.Suppose you connect two cells in series with each other and then connect this series combination parallel to a third cell of 18 V. What is now the total voltage? Provide a diagram for each combination of cells.

Answer 1

Explanation:

We know that internal resistance of a cell is given by

r=R(

V

E

−1)

Where R= total external resistance ,

E= total emf of cell ,

V= terminal voltage ,

given E=1.5V,V=1.4V

now as two given resistances are in parallel therefore total external resistance ,

R=

7+7

7×7

=

14

49

Ω

therefore r=

14

49

(

1.4

1.5

−1)=0.25Ω

r= total internal resistance of the cells,

now the two cells are in parallel therefore internal resistance of each cell ,

r=

r

′

+r

′

r

′

×r

′

or 0.25=

2r

′

r

′2

or r

′

=0.50Ω

Explanation:

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