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tlauridsen1-Visitor
1-Visitor
November 19, 2015
Solved

Kirchoff - solve block Prime

  • November 19, 2015
  • 8 replies
  • 3224 views

In MathCad 14 it was no problem using solve combined with Kirchoff laws on a circuit to figure out different current, but in MathCad Prime it doesn't work when i type the same things in solve block.

What am I doing wrong?

MathCad 14 on the left and Prime on the right

Kirchoff.jpg

8 replies

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MikeArmstrong1-Visitor
1-Visitor
November 19, 2015

Firstly can you provide a worksheet as it is difficult to determine the issue from an image.

However, it seems you are solving symbolically in Mathcad and not in Prime. Is there a reason you are solving symbolically?

Mike

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    tlauridsen1-VisitorAuthor
    1-Visitor
    November 19, 2015

    I have just used the method that i have been tought one my Nspire.

    R
    RichardJ19-Tanzanite
    19-Tanzanite
    November 19, 2015

    In MC 15 (left panel) you are using a symbolic solve, which does not require guesses for the variables you wish to solve for. In Prime (right panel) you are using a numeric solve, which does require guesses. Either use a symbolic solve, or add guess values for the currents.

    You should also get rid of the first equation. Given I1 and I2 it's trivial to calculate I after the solve block.

    Lastly, Prime includes a converter that will convert MC 15 worksheets to Prime worksheets. That saves you the work of retyping everything, and also avoids the possible errors associated with doing that.

      V
      ValeryOchkov24-Ruby IVAnswer
      24-Ruby IV
      November 19, 2015

      See please pictures 17/15-17.18 and one Mathcad Prime sheet here - Study 17. Cogeneration (CHP), trigeneration (CCHP) and quadrogeneration (CCHPI) or  how  much  of  mathematic is contained in thermal engineering

        V
        ValeryOchkov24-Ruby IV
        24-Ruby IV
        November 19, 2015

        Thanks for the correct answer!

        The book Elrctrical Engineering studies with Excel, Mathcad and Internet is in costraction!

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        tlauridsen1-VisitorAuthor
        1-Visitor
        November 19, 2015

        Arh know I can see it... Those guess values are totally misunderstood by me. It works know. But I can't see the idea of theses guess values?  Can anyone explain it to med?

        M
        MikeArmstrong1-Visitor
        1-Visitor
        November 19, 2015

        I suggest you read up on Solve Blocks in the help menu.

        Mike

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