Ideal cells in parallel combination

AI Thread Summary
When connecting two ideal cells with different EMFs, such as 6 volts and 3 volts, in parallel, the net EMF cannot be simply determined due to the implications of internal resistance. It is impractical to label them as ideal cells since internal resistance must be considered when no external resistance is present. Additionally, ideal voltage sources with differing voltages cannot be connected in parallel without violating their definitions. The discussion highlights that while ideal components are useful in introductory electronics, real-world applications require consideration of internal resistances. Ultimately, understanding these principles is crucial for accurate circuit analysis.
saurabh tiwari
good evening to all
if two ideal cells with emf 6 volt and 3 volt are connected in parellel to supply current how the net emf can be decided
 
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saurabh tiwari said:
good evening to all
if two ideal cells with emf 6 volt and 3 volt are connected in parellel to supply current how the net emf can be decided
I think internal resistances must be given for parallel combination of cells..
 
Thanks to all... It is same as best of my knowledge now i know that i am right [emoji6][emoji6]
 
saurabh tiwari said:
Thanks to all... It is same as best of my knowledge now i know that i am right [emoji6][emoji6]
And what is the conclusion that you "know is right" ?
 
That it is impractical to say them ideal cell. Coz we ignore the internal resistance of a cell sometimes in comparison to external resistancesand call it ideal but when no external resistance is present you have to consider the internal resistance
 
saurabh tiwari said:
That it is impractical to say them ideal cell. Coz we ignore the internal resistance of a cell sometimes in comparison to external resistancesand call it ideal but when no external resistance is present you have to consider the internal resistance
Ah, yes. You are right, but ideal components are the staple of introductory electronics. and it is more correct to say that you simply cannot PUT ideal voltages sources with different voltages in parallel because you would thereby violate the definition of one or the other or both.
 
Just for completeness...

You can't connect two ideal current sources in series either.
 
What is the problem in series combination
 
  • #10
saurabh tiwari said:
What is the problem in series combination
cwaters said ideal CURRENT sources cannot be put in series. Again, it would violate the definition of one or the other or both (unless they had identical values, in which case it's just silly)
 
  • #11
ImageUploadedByPhysics Forums1433420002.408990.jpg

Is there any problem in this solution
 
  • #12
No problem, since ideal voltage sources can go in series (and ideal current sources can go in parallel)
 
  • #13
Ok ok got it
 

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