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Find the Total Current in a Single Loop Circuit

  1. Aug 18, 2012 #1
    1. The problem statement, all variables and given/known data
    Find the current flowing through the circuit.
    http://wildedge.zxq.net/IMG.jpg

    2. Relevant equations
    Amps=Total Voltage / Total Resistance


    3. The attempt at a solution
    (20 + 12 + 12 + 3) / (10 + 5 + 30 + 40 + 20 + 15)=0.39A

    I'm almost certain that this is wrong. I don't even know if the formula I used is actually valid. Any help you can provide would be greatly appreciated.

    On an unrelated note, has anyone seen a good explanation of the right-hand rule (for magnetic fields)?

    ***Sometimes, the image might not display. I don't know why. If that happens, right click the little icon that shows in its place and copy the image URL.
     
    Last edited: Aug 18, 2012
  2. jcsd
  3. Aug 18, 2012 #2

    gneill

    User Avatar

    Staff: Mentor

    Your Relevant Equation is okay, but beware that the polarity of the individual voltage sources matter; look closely at each of the battery symbols as you 'go around' the loop.
     
  4. Aug 19, 2012 #3
    if you go around the loop carefully, i think the answer is (-20+12+12-3)/(5+30+40+20+15+10)=0.00833A
     
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