Posted 12 September 2021 - 08:53 AM
Hello. I am an electrical engineering student and we have a lot of calculations with AC circuits.
Im am trying to figure out how to use the calculator for the following calculations.
Calculator in use: ClassPad II fx-CP400
Here are the examples:
I was able to calculate the ones where I just add them together, like this:
But when I try dividing or multiplying, I get this:
Always the same error, Invalid Dimension.
Sometimes when I have to calculate the impedance of a circuit, I would also need to somehow enter the following into the calculator:
But here I also get the error: Invalid Dimension.
I am very close to just throwing this calculator away and getting an TI, where I know calculations like these are very easy and do not require the "[" and "]" for example.
Any help would be appreciated. I've been searching the internet for a long time now and for some reason can not figure it out.
Posted 12 September 2021 - 01:10 PM
I have tested multiplication and division from the above examples on afx-2.0+ and on fx-9750GII. There were no any problems.
I don`t have an fx-CP400, but I can assume the following: your calculator in the above image, apparently, operates with the type of variables Mat or Vct. Multiplying a string by a string causes the message Invalid Dimension. Does this calculator have a different syntax for such calculations?
This is a formal approach to the problem. It seems to me that in electrical engineering, when calculating with vectors, the commands DotP (dot product) or CrsP (cross product) should be also used.
- marko likes this
Posted 12 September 2021 - 02:52 PM
Big thanks to both of you!
All I indeed had to is what was in the link you sent:
∠(5,θ) * ∠(75,-90)
gives me exactly the results I need.
My calculator was in RAD mode and first I kept getting weird results with pan.gejts suggestion, but changing to DEG fixed it.
I am not familiar with DotP (dot product) or CrsP. I will look into those as well, but for now I am very happy with being able to do these calculations.
It just means now that I must do my homework .
Also tagged with one or more of these keywords: vectors, electrical calculations
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