Combination circuits

Discussion in 'Homework Help' started by luvm, Dec 11, 2011.

  1. luvm

    Thread Starter New Member

    Dec 11, 2011
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    Please help solve.

    [​IMG]
    [​IMG]
     
    Last edited: Dec 11, 2011
  2. bertus

    Administrator

    Apr 5, 2008
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    Hello,

    The image is broken.
    Can you post it on the server?

    Bertus
     
  3. luvm

    Thread Starter New Member

    Dec 11, 2011
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    I'm new to this site and I'm confused. I tried attaching but it wouldn't attach, any tips
     
  4. bertus

    Administrator

    Apr 5, 2008
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    Hello,

    From the FAQ:

    Bertus
     
  5. luvm

    Thread Starter New Member

    Dec 11, 2011
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    please see attached file
     
  6. luvm

    Thread Starter New Member

    Dec 11, 2011
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    Bertus: I reposted with attachment, at 4.17, please help
     
  7. bertus

    Administrator

    Apr 5, 2008
    15,638
    2,344
    Hello,

    I merged the threads, as you could also have posted it here.
    Most members do not like the DOC format as they need an external program to look at them.

    I have extracted the two question from the DOC and posted them here:

    [​IMG]

    and

    [​IMG]

    What have you done yourself to solve the problems?

    You might also take a look at this chapter from the eBook of this site:
    http://www.allaboutcircuits.com/vol_1/chpt_10/index.html

    Bertus
     
  8. luvm

    Thread Starter New Member

    Dec 11, 2011
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    for the first circuit I used the total current to determine total resistance, I also knew that total current passes through R1, R5 and R6. using ohm's law I can find voltage drop through R5 and R6. using kirchoff's voltage law in the first loop, I'm trying to determine Voltage through R2 and R1 but this is where I'm stuck. I can't figure out what the voltages are through R1 and R2. From Kirchoff's current law I know that total current equals current though R2 and R3 but R3 is unknown so I can't use this law to find either of these unknowns.
     
  9. luvm

    Thread Starter New Member

    Dec 11, 2011
    6
    0
    forgot to tell you about the 2nd circuit. From observation I'm thinking the10V passes R1 since they're in series. I can now find current through R1. Current in R1 enters the parallel loop and is shared between the resistors. R4 is unknown, but R2 and R3 are in series so I know the voltage is 10V through this loop, so I can find current through these resistors. Then using kirchoff's current law I can find current through R4, then use this with 10V to find R4. Not sure this is correct please help
     
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