Finding the battery voltages in this circuit

  • Thread starter Eitan Levy
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Homework Statement


This circuit is given:[/B]
upload_2017-12-16_22-10-55.png

What are the values of ε1 and ε3?

Homework Equations


IR=V

The Attempt at a Solution


I get the right answer for ε1 (3V).
But I get that ε3=12V and not 15 (the answer in the textbook).
First the charge from a to b is 3A.
Then I simply use Kirchhoff's second law, which gives: 2Iab-6+10+2-ε3=0.
That gives ε3=12.
Am I wrong or the book? Maybe the charge from a to b is not 3A?
 

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  • #2
phinds
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Am I wrong or the book?
book is wrong
Maybe the charge from a to b is not 3A?
How could that POSSIBLY be true? If it were, then the currents into/out of node b would not add up to zero. A miracle.
 

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