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Simple Kirchoff's loop problem

  1. Oct 16, 2014 #1
    1. The problem statement, all variables and given/known data
    Find the currents going through each resistor.
    media%2F2d8%2F2d84bb09-154d-41ef-a5d7-cc0215f3ad3a%2FphpMrLurv.png

    2. Relevant equations

    V=IR
    3. The attempt at a solution

    media%2Fb0d%2Fb0da98b6-e7ee-454a-8e9e-b6c40181f50e%2FphpYUlKvm.png


    I have the problem worked out and I cant find any errors in my work. The issue is that my professor has:

    I1=-.0843
    I2=.086
    I3=.0017

    However my physics professor is notorious to make errors in class and right sloppily, so I don't entirely trust his solutions. Can you find any error in my work/confirm my results? Sorry about the picture being sideways.
     
  2. jcsd
  3. Oct 16, 2014 #2
    Sorry, struggling getting the picture up....in the meantime my answers are:

    I1=-8.461
    I2=-.00392
    I3=-.00477
     
  4. Oct 16, 2014 #3
    image11_zps570405bb.jpg
     
  5. Oct 17, 2014 #4

    gneill

    User Avatar

    Staff: Mentor

    Your answers are missing units, making it difficult to say whether they are numerically correct. You'd definitely lose marks though for not showing units.

    Assuming your results are in Amps then I2 and I3 look to be correct numerically, but I1 is not... it's got the wrong order of magnitude. So check your calculation there.
     
  6. Oct 17, 2014 #5
    Yes, sorry about that. They are in amps. I missed the scientific notation in my matrix. Should I1= -8.461e(-4)?
     
  7. Oct 17, 2014 #6

    gneill

    User Avatar

    Staff: Mentor

    Yes, that's right.
     
  8. Oct 17, 2014 #7
    Okay, thank you.
     
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