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Homework Help: Physics Current Problem (I1,I2,I3)

  1. Feb 28, 2012 #1
    1. The problem statement, all variables and given/known data

    1. Determine the currents I1, I2, and I3 in the figure. Assume the internal resistance of each battery is 1.3 ohms.

    2.What is the terminal voltage of the 6v battery?

    Picture http://i945.photobucket.com/albums/ad291/buddy72192/GIANCOLIch19p32.jpg

    2. Relevant equations
    Ok, so from what I can tell I1=I2+I3 for this equation.

    3. The attempt at a solution
    I went around counterclockwise for both loops and came up with:

    Loop #1
    11.3I2 + 21.3I1 = 24
    Loop #2
    34.3I3 - 11.3I2 = -6

    To get common I's I subbed (I1 - I2) in for I3

    So Loop #2 becomes....
    34.3I1 - 34.3I2 -11.3I2 = -6

    When I solved for that I got (Incorrect)

    Please Help! I've been trying for over 2 hours
  2. jcsd
  3. Feb 28, 2012 #2


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    Staff: Mentor

    Hi buddy72192, Welcome to Physics Forums.

    As far as I can see your stated results look fine. Perhaps you have a significant figures or required units issue when entering the results?
  4. Feb 28, 2012 #3


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    Staff: Mentor

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