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A kirchoff's law question with multiple batteries

  1. Apr 25, 2012 #1
    1. The problem statement, all variables and given/known data
    To find the voltage at the 5 ohms resistor.


    2. Relevant equations
    V=IR
    Kirchoff's first and second law



    3. The attempt at a solution
    The attempt was simply too long
    I ended up with a voltage of 6.5V on the 5 ohm resistor...
    Please help me, I have been stuck in this same question for two weeks.
    What I wasn't confident with was the three batteries too...
    1. The problem statement, all variables and given/known data



    2. Relevant equations



    3. The attempt at a solution
     

    Attached Files:

  2. jcsd
  3. Apr 25, 2012 #2

    NascentOxygen

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    Staff: Mentor

    Could I suggest that you do yourself a favour and resolve to never refer to a voltage "at" any element? By always referring to "a voltage across" an element, or to a "voltage between two points" you will be giving yourself a subtle reminder of how you must go about determining the parameter.

    So, what approach will you use for determining the voltage across the resistor in question?
     
  4. Apr 25, 2012 #3

    gneill

    User Avatar

    Staff: Mentor

    You'll have to show an attempt before we can know how to help. Them's the rules.

    As a suggestion, write a KCL node equation for the node where all the resistors come together. Choose the bottom node as the ground reference.
     
  5. Apr 26, 2012 #4
    never mind guys i solved it, thank you
     
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