# equivalent emf for cells of unequal emfs connected in parallel?

In a reference book, a question was asked to whether three cells of unequal emfs are characterized by a definite emf and internal resistance.

I thought the answer to be in the affirmative. But no, in the book it's given that there is No Formula for calculaing the equivalent emf and equivalent internal resistance of non-similar cells joined in parallel.

But only minutes before I had read the formulae for determining these quantities: Now, we can easily determine the equivalent end and equivalent internal resistance from these formulae, can we not? So what am I missing?

Is there something wrong with how I interpreted what these formulas mean or what my book really said?

EDIT: The concerned question and the solution are shown below:  • Hi Mr Reality please could you give the name of the book? Sep 2 '17 at 18:30
• @Quantum spaghettification, its given in the ncert course textbook for class 12 physics and also in a reference book for the same:- S.L. Arora. (These books are standard textbooks for students in India) Sep 2 '17 at 18:45
• Please can you upload an image of the question in the book and the answer given at the back of the book? Sep 2 '17 at 18:50
• @sammy gerbil, I've added the pictures. Sep 2 '17 at 19:04
• The answer given in the book points out that there won't be a formula like shown in first picture. Just a equation given by Kirchoff's law. Its understandable from my comment. If you connect batteries in parallel order with just a wire with no resistor then you won't get any formulas just, an equation form Kirchoff's laws. Sep 2 '17 at 20:02