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myang1-Visitor
1-Visitor
Aug 20, 2014 2:15 PM UTC
Solved

how to simplify an expression with both variables and numbers

Hi All,

This is my first time using Mathcad...... I have this problem which seems to be not hard, however I just can't figure out..........

Would anyone like to help me out here? I've include text explanation of my problem in the attached file.

Many thanks in advance!

Mingyu

AlanStevensAnswer
19-Tanzanite
Aug 20, 2014 9:17 PM UTC

Here's a screenshot:

voltageripple.PNG

I've attached a pdf printout (though you will have to line up pages 3 and 4 with 1 and 2 respectively.

Alan

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14 replies

ValeryOchkov24-Ruby IV
24-Ruby IV
Aug 20, 2014 3:06 PM UTC

May be this help you:

IU.png

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myang1-VisitorAuthor
1-Visitor
Aug 20, 2014 4:15 PM UTC

Thank you, Valery. Reminds me that I need to make expression as function of unspecified variables.

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AlanStevens19-Tanzanite
19-Tanzanite
Aug 20, 2014 3:22 PM UTC

Does the attached help?

Alan

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myang1-VisitorAuthor
1-Visitor
Aug 20, 2014 4:37 PM UTC

Thank you very much, Alan. It's very helpful. Learn a lot from your tips. But please allow me to ask another question.........

I runned your attached file but yours stopped at the calculation of C with no result.

This happened to my original file as well, but mine gave me something as below. It just fails to extract the imaginary part of Ztot.....It doesn't make sense to me as it's able to get the real part....

Capture.PNG

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RichardJ19-Tanzanite
19-Tanzanite
Aug 20, 2014 5:22 PM UTC

Hard to be sure without seeing the file, but if you click on Im(Ztot) you will probably see a multiplication between the Im and the parenthesis, so it sees Im as a variable, not a function name.

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