Wrong final result in superposition theorem

  1. I have this assignment, basically I had to do the same thing in simplified way and then superposition theorem. Apparently the answers don't match. I'm pretty sure the mistake is in superposition theorem. It could be some really stupid and simple mistake I made since I'm no good at this at all.

    I'd be really grateful if anyone could help me fix it.

    I=U/R
    I1=-2,2 I1=5/10
    I2=0,4 I2=15/10
    I3=-1,8 I3=30/10

    K1=I1-I2+I3
    K2=E1-E2=I1*R1*R2
    K3=E2-E3=I2(R2+R3)
    K2=5-15=I1*10+I2*15
    I1=10+20+15I2=30+15I2
    K22=15*30=I2=(-15)+I3*15
    I2=15+30-15+15I3=153

    16I2=15I1
    I2=0,938I1

    I1=30+15*0,938I1
    I1=30+I10,7I1
    -13,07I1=30
    I1=-2,2

    I2=0,938*(-2,2)
    I2=0,4
    I3=-2,2-(-0,4)
    I=-1,8
    R1kogu=R1+(R2*R3)/R2+R3
    R1kogu=10+(15*15)/15+15=10+7,5=17,5
    I1=E1/R1total=5/17,5=0,286
    U1=R1*I1=17,5*0,286=5,005
    I2=U2/R2
    I2=0,005/15=0,0003
    I3=0,0286-0,0003
    I3=0,2867

    RtotalR2=(R1*R3)/(R1+R3)=15+(10*15)/(10+15)=6+15=21
    I2=15/21=0,714
    U2=R2*I2=15*0,714=10,71
    U1=U2=E2-U2=15-10,71=4,29
    I3=4,29/15=0,286
    I1=I2+I3=0,714+0,286
    R3total=R3+(R1*R2)/(R1+R2)=15+(10*15)/(10*15)=21
    I'''3=15/21=0,714

    U3=R3*I'''3=15*0,714=10,71
    U1=U3*E3-U3=15-10,71=4,29
    I''2=4,29/15=0,286
    I'''1=I2+I3=0,714+0,286=1 A

    Current: 1A, I2 = 0,286 and I3 = 0,714

    So this is it, any kind of help would be greatly appreciated. Thanks for your time.
     

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    Last edited: Apr 3, 2012
  2. jcsd
  3. It is hard to help without a picture of the circuit. Could you upload one?
     
  4. Oh sorry, I completely forgot it. I attached it now to the original post.
     
  5. What's the question? What exactly are you looking for? Is that circuit diagram part of the original question? What is kogu?

    It would also help not writing equations like this:

    I1=10+20+15I2=30+15I2

    The 15*I2 can be mistaken for 1512.

    I don't mean to be rude, but most of that is not very easy to follow at all. If you did the actual question like that, it could be why you're getting an error somewhere.
     
  6. "Kogu" means total. The assignment isn't in english. I copied it directly from a word document, so the format got messed up a bit. I'll try to make it more readable.

    Yes, this circuit diagram came with the assignment. I need help finding an error, the final result is incorrect.
     
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