problem

Discussion in 'Homework Help' started by jo-jo2004, Dec 11, 2010.

  1. jo-jo2004

    Thread Starter New Member

    Dec 11, 2010
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    hello

    i want to solve this problem as soon as ,please


    [​IMG]
    Regards
     
  2. hgmjr

    Moderator

    Jan 28, 2005
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    What have you been able to do so far?

    hgmjr
     
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  3. Georacer

    Moderator

    Nov 25, 2009
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    This is a very nice example of the theorem of supperposition. Do you know about it?
     
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  4. jo-jo2004

    Thread Starter New Member

    Dec 11, 2010
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    thanx hgmjr and georacer

    How do I find the resistanceHow do I find the resistance R ??
     
  5. Georacer

    Moderator

    Nov 25, 2009
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  6. hgmjr

    Moderator

    Jan 28, 2005
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    You do not need to know the value of R in this circuit. Since it is in parallel with a voltage source, it will not effect the value of the voltage Vx.

    hgmjr
     
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  7. jo-jo2004

    Thread Starter New Member

    Dec 11, 2010
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    I know this method
    But in the question, there is no R value unknown??
    How do I find??
     
  8. retched

    AAC Fanatic!

    Dec 5, 2009
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    You do not need R.

    Forget R.

    You do not need R to solve this.
     
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  9. jo-jo2004

    Thread Starter New Member

    Dec 11, 2010
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    How??? Please solve the question to me
     
  10. jo-jo2004

    Thread Starter New Member

    Dec 11, 2010
    14
    0
    How??? Please solve the question to me
     
  11. thatoneguy

    AAC Fanatic!

    Feb 19, 2009
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    To find Vx, you only need to know the current flowing through the 5Ω resistor.

    R doesn't matter, as the voltage across R is 10V. That value is needed for the voltage on the left side of the top resistor.

    Check out the links given above, giving you the answer to this question will not help you at all if the resistors change, or the current source and voltage source are switched around for the test.
     
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  12. jo-jo2004

    Thread Starter New Member

    Dec 11, 2010
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    ok:), but What is the current passing through the resistance 5??

    Current in the resistance 5 of voltage source and current source , right??
    And how I find??

    They gave me the solution please my exam tomorrow
     
  13. jo-jo2004

    Thread Starter New Member

    Dec 11, 2010
    14
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    i have Known solution to this question:):):)
    Thanks you everyone
    My greetings to you;)
     
  14. thatoneguy

    AAC Fanatic!

    Feb 19, 2009
    6,357
    718
    The current through R WILL add to the total current being used by the circuit, but that current doesn't matter when calculating Vx (the current through the 5 Ohm).

    Hopefully that was explained to you in class.
     
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