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
I have already figured out the correct values and directions (see image) of the currents:
I1=0.84 A, I2=1.39 A, I3=0.56 A
U=P[tex]\Delta[/tex]t = VI[tex]\Delta[/tex]t
The Attempt at a Solution
I know the correct answer which is: P=VI3[tex]\Delta[/tex]t but I am not convinced with it. What bothers me in it is the current we chose: Isn't I3 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 ?