Double battery circuit

  1. 1. The problem statement, all variables and given/known data

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

    2. Relevant equations

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

    3. 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?
     
  2. jcsd
  3. gneill

    Staff: Mentor

    Must be a problem with your algebra. Your equations appear to be set up okay.
     
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