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Grade: 12th pass
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
9 months ago

Answers : (2)

Saurabh Koranglekar
askIITians Faculty
4005 Points
							Dear student

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9 months ago
3008 Points
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 
7 months ago
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