What are the current and power equations for a double battery circuit?

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SUMMARY

The discussion focuses on solving a double battery circuit problem involving Kirchhoff's laws to determine the currents I1, I2, and I3, as well as the power delivered to each resistor. The user attempted to set up three equations based on Kirchhoff's rules but encountered incorrect results. The equations formulated were: 21 - I1R1 - I3R = 0, 15 - I2R2 - I3R = 0, and I3 = I1 + I2. The consensus is that the equations are correctly structured, indicating potential algebraic errors in the user's calculations.

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Homework Statement



I have this circuit:
http://img59.imageshack.us/i/doublebattery.png/

Homework Equations



what are the currents I1, I2, and I3
and the power being delivered on each resistor

The Attempt at a Solution


i've tried doing 3 equations using the kirchhoff rules but i end up with the wrong answer...my equations were
21 - I1R1 - I3R = 0
15 - I2R2 - I3R = 0
I3 = I1 + I2
what am i doing wrong?
 
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Must be a problem with your algebra. Your equations appear to be set up okay.
 

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