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Kirchhoff's rule and multivariable algebra

  1. Oct 18, 2011 #1
    I'm working on some voltage/current physics problems and I think I understand the concepts however I believe the algebra is holding me back(not my strong point). Could someone make some suggestions how I could solve for at least one of these variables by using a combination of theses three equations?

    eq 1) A+B=H

    eq 2) A(0.1) + 12 = B(0.01) +14

    eq 3) B(0.01) + H(1.20) = 12

    I believe that the first step is to expand eq 3 since H=A+B into

    B(0.01) + A(1.2) + B(1.2) = 12 but beyond that I am unsure.

    thanking you in advance,
    Linus
     
  2. jcsd
  3. Oct 18, 2011 #2

    SammyS

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    Solve eq 2) for A. Plug that into your last equation
     
  4. Oct 18, 2011 #3
    Is this what you mean?

    A(0.1) + 12 = B(0.01) +14
    A= 20+ B(0.1)


    Cheers, thanks so much.
     
  5. Oct 18, 2011 #4

    SammyS

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    Yes.

    Now put {20+ B(0.1)} into B(0.01) + A(1.2) + B(1.2) = 12 , in place of A.
     
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