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## Homework Statement

Find the energy delivered by the 4.00 V battery in the circuit.

R1=8.8 ohm, R2=2.5 ohm, V=15 volts, [tex]\Delta[/tex]t=3.30 minutes

http://www3.zippyshare.com/scaled/51639486/file.html

I have already figured out the correct values and directions (see image) of the currents:

I

_{1}=0.84 A, I

_{2}=1.39 A, I

_{3}=0.56 A

## Homework Equations

U=P[tex]\Delta[/tex]t = VI[tex]\Delta[/tex]t

## The Attempt at a Solution

I know the correct answer which is: P=VI

_{3}[tex]\Delta[/tex]t but I am not convinced with it. What bothers me in it is the current we chose: Isn't I

_{3}the current contributed from both batteries and not the 4.00 V battery's own produced current ? Thus, shouldn't we try to find the current exclusively from the 4 V battery and use that value in our calculations ?