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Two cells of emf 1v, 2v and internal resistance 2volt per meter respectively connected serious and parallel. What should be the external resistance be the same

Two cells of emf 1v, 2v and internal resistance 2volt per meter respectively connected serious and parallel.  What should be the external resistance be the same
 

Grade:12th pass

2 Answers

Saurabh Koranglekar
askIITians Faculty 10335 Points
3 years ago
Dear student

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Khimraj
3007 Points
3 years ago
In series effective emf =2+1=3V
effective internal resistance =2+1=3ohm 
total resistance =3+R ohm 
where R=external resistance
current through the circuit=current through the external resistance =3/3+R ampere 
in parallel effective emf =2V
effective resistance =2/3ohm 
total resistance =2/3+R. ohm
current through the external resistance
=2/(2/3+R) Ampere
in two cases current is same 
then solving two equation we get R=4ohm
as in series connection resistance is more so heat will generate more in series connection 
hope this will help you 

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