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Please check my answers: Combined Circuit

  1. May 26, 2016 #1
    1. The problem statement, all variables and given/known data
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    10z8p02.jpg
    2. Relevant equations


    3. The attempt at a solution
    Vt=30V
    It=4.3A
    Rt=7Ω

    V1=12.9V
    V2=2.15V
    V3=2.15V
    V4=4.3V
    V5=12.9V
    VA=4.3V
    VB=4.3V

    I1=4.3A
    I2=2.15A
    I3=2.15A
    I4=2.15A
    I5=4.3A
    IA=2.15A
    IB=4.3A

    R1=3Ω
    R2=1Ω
    R3=1Ω
    R4=2Ω
    R5=3Ω
    RA=2Ω
    RB=1Ω

    Did I break down the problem correctly? And are all these calculations correct?
     
  2. jcsd
  3. May 26, 2016 #2
    Yes, it seems correct.
     
  4. May 26, 2016 #3

    Charles Link

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    Homework Helper

    It looks reasonably good, but electrical currents do have a direction=normally you mark the direction with an arrow and if the current goes opposite to the arrow, it is then a negative current. Also, the voltages you have are voltage drops across the resistors. Often the question will be what is the voltage at a point in the circuit, and in order to do this, a point in the circuit (e.g. the "-" terminal of the voltage source) will be designated as the "V=0" or "ground" point. Then the "+" terminal of the battery will be V=+30 V, and the voltages at other locations are determined from the voltage drops. All in all, you did reasonably good.
     
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