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Circuit Diagram Confusion

  1. Feb 3, 2013 #1
    1.http://imgur.com/d2lf8sa



    2. V=IR



    3. I feel like the answer should just be .012 because 1.2/100. Apparently that is wrong. If that is truly wrong. I also found I3 to be 3.25mA because 3.9 volts in parallel and V=IR
     
  2. jcsd
  3. Feb 4, 2013 #2

    CWatters

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    What does Vs2 do to the voltage across R3?

    Then apply KVL around the left hand loop.
     
  4. Feb 4, 2013 #3
    Vs2 makes the voltage across R3 equal to Vs2? Then if I apply KVL to the left side I have 2 unknowns Vr1 and Vr2. Should I have another KVl loop?
     
  5. Feb 4, 2013 #4

    NascentOxygen

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    Staff: Mentor

    Write the equation for the sum of the voltages around the left-side loop.

    The same current goes through R1 as R2.
     
  6. Feb 4, 2013 #5

    CWatters

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    Vr1 and Vr2 aren't really "unknown"...

    Vr1 = I1 * R1
    Vr2 = I1 * R2

    As we said, write the KVL equation for the left hand loop.

    As I hinted earlier Vr3 = Vs2 (which is known).

    Come back if still stuck.
     
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