Thevenin Equivalent - Help needed

Discussion in 'Homework Help' started by sinbad, Feb 26, 2009.

  1. sinbad

    Thread Starter New Member

    Feb 26, 2009
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    0
    I'm currently stuck at an assignment where I have to calculate the Thevenin voltage for a circuit. I know how to do this for simpler circuits, but this one was too much for me to handle. I calculated the Thevenin resistance to be 5.2Ω, which I know is the correct solution. If someone could enlighten me to how I can find the Thevenin voltage I'd be grateful. A step by step guide would really make me happy :)


    http://image-upload.de/image/JMLEeZ/4f097e0b9b.jpg
     
  2. silvrstring

    Active Member

    Mar 27, 2008
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  3. sinbad

    Thread Starter New Member

    Feb 26, 2009
    3
    0
    I appreciate your help. The problem is that the mesh-current method is not a part of our curriculum. So, basically we have to use another method to solve this. I've tried using the node-voltage method, which I assume is intended, but I'm not quite sure how to do it on this particular circuit.
     
  4. The Electrician

    AAC Fanatic!

    Oct 9, 2007
    2,281
    326
    Maybe the Vth could be easily found as part of finding Rth. Show how you obtained the Thevenin resistance, and we'll offer help with the rest.
     
  5. sstbrg

    Active Member

    Nov 29, 2008
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    0
    It's quite possible to use node analysis as well - you'll find the voltage on R5 right away.
    You have 3 nodes there, which means 3 equations. If you have a nice calculator you can solve them quickly.

    Oh, "not a part of our curriculum" - make it a part of your curriculum then. Loop analysis is a very good and easy technique, and you'll miss a lot if you don't learn it.

    Oh, more info on analysis:
    http://www.youtube.com/watch?v=2vHGYdepKLw
    http://www.youtube.com/watch?v=RsJ1eg7XNVs
    Good stuff
     
  6. sinbad

    Thread Starter New Member

    Feb 26, 2009
    3
    0
    Thanks :) managed to solve it using the node voltage method.
     
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