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

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    Battery Circuit
AI Thread Summary
The discussion focuses on solving a double battery circuit involving three currents (I1, I2, I3) and the power delivered to each resistor. The user attempted to apply Kirchhoff's rules to establish equations but encountered incorrect results. The equations set up were deemed appropriate, suggesting that the issue lies in the algebraic manipulation rather than the initial setup. Participants emphasize the need to carefully check calculations to resolve the discrepancies. Accurate algebra is crucial for determining the correct currents and power in the circuit.
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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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