thevenin equivalent, right answer?

Discussion in 'Homework Help' started by lippyf, Sep 26, 2015.

  1. lippyf

    Thread Starter New Member

    Sep 26, 2015
    15
    0
  2. WBahn

    Moderator

    Mar 31, 2012
    17,788
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    Most members are hesitant to click on external links. Please attach your image here, scaling it if necessary to make it reasonably sized. You should be able to scale most images to 600 pixels wide or less and get files sizes under a couple hundred kilobytes.

    If your image is just the problem, don't expect too many people to put forth the time and effort to solve the problem from scratch just to tell you whether you got the right answer or not. You should be able to verify the correctness of your own answer readily enough and, if you can't, then it is probably time to learn how.

    Instead, post YOUR work on YOUR homework problem, so that people can follow YOUR work and verify that it is correct or, if it isn't, can point out where you are going wrong.
     
  3. Cyberduke

    Active Member

    Mar 5, 2011
    33
    1
    If you are an electrical engineering or some sort of student, you will soon have to start modeling circuits on some software. There is a free tool named LT spice which is incredibly helpful. So if you you need help understanding of checking of an answer it is often useful to model your circuit and then you would be sure. You also learn to use the software which is a bonus. The software is not hard to use.

    Also just posting an answer will not get me to check it. Posting your whole method step by step makes it easier for us to see where you are doing wrong, just like WBahn said.
     
  4. lippyf

    Thread Starter New Member

    Sep 26, 2015
    15
    0
    Ok, this is how I did to find U_oc and I_sc.

    The original circuit
    [​IMG]

    To find U_oc:
    Simplify the ciruit
    [​IMG]

    After the simplify
    [​IMG]

    To find I_sc:
    Simplify
    [​IMG]

    After
    [​IMG]

    Calculation for both U_oc and I_sc
    [​IMG]
     
  5. WBahn

    Moderator

    Mar 31, 2012
    17,788
    4,808
    Again, many members will not follow external links -- they don't know whether the site you have linked to is malicious or not. Besides, it is HIGHLY preferred that you upload your images to AAC so that they are archived on the AAC server. Who knows whether the images on a third-party server will still be available five or ten years from now (or whether the server itself will still be available). If they are archived on the AAC server, then they will be available as long as AAC is around.
     
  6. lippyf

    Thread Starter New Member

    Sep 26, 2015
    15
    0
    Ok, one more try.

    The original ciruit, see attached image circ.jpg

    To find U_oc:
    Simplifying the ciruit
    u1.jpg

    After the simplify
    u2.jpg

    To find I_sc:
    Simplifying
    i1.jpg

    After simplify
    i2.jpg

    Calculation for both U_oc and I_sc
    calc.jpg
     
    • calc.jpg
      calc.jpg
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    • u1.jpg
      u1.jpg
      File size:
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    • u2.jpg
      u2.jpg
      File size:
      3 MB
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    • i1.jpg
      i1.jpg
      File size:
      3.2 MB
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      5
    • i2.jpg
      i2.jpg
      File size:
      3.2 MB
      Views:
      4
    • circ.jpg
      circ.jpg
      File size:
      54.6 KB
      Views:
      5
    Last edited: Sep 27, 2015
  7. lippyf

    Thread Starter New Member

    Sep 26, 2015
    15
    0
    Nevermind I got the answer, thanks anyway
     
  8. WBahn

    Moderator

    Mar 31, 2012
    17,788
    4,808
    Getting close. Your files are still huge and many people won't or can't download such large files, especially when there is simply no need for it.

    Take your u1.jpg. It's a 3.1 MB monster. I took the time to download it and then just opened it in Paint, cropped the stuff that wasn't needed, and scaled it to 600 pixels wide. Here's the result in a 41 kB file, less than 1.5% of the original file size -- and it took right at a minute to do.

    Example.jpg
     
  9. WBahn

    Moderator

    Mar 31, 2012
    17,788
    4,808
    Glad to hear it.

    If nothing else, you learned how to effectively post questions and images to the forum the next time around so that we can get right to your problem.
     
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