Bug 995228 - Qucs gives different voltage values to the same circuit using ohms and siemens
Qucs gives different voltage values to the same circuit using ohms and siemens
Product: Fedora
Classification: Fedora
Component: qucs (Show other bugs)
i686 Linux
unspecified Severity high
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Assigned To: Jaromír Cápík
Fedora Extras Quality Assurance
Depends On:
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Reported: 2013-08-08 15:24 EDT by Brallan Jesús Aguilar Rivera
Modified: 2016-01-31 20:58 EST (History)
5 users (show)

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Fixed In Version:
Doc Type: Bug Fix
Doc Text:
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Clone Of:
Last Closed: 2015-02-17 11:39:44 EST
Type: Bug
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Attachments (Terms of Use)
Diagram using ohm units (2.35 KB, text/plain)
2013-08-08 15:24 EDT, Brallan Jesús Aguilar Rivera
no flags Details
Diagram using siemens units (2.33 KB, text/plain)
2013-08-08 15:26 EDT, Brallan Jesús Aguilar Rivera
no flags Details

  None (edit)
Description Brallan Jesús Aguilar Rivera 2013-08-08 15:24:45 EDT
Created attachment 784567 [details]
Diagram using ohm units

Description of problem:
I do a circuit simulation with resistors, dependent and independent current sources. I perform two identical diagrams, but one use siemens and the other one use ohms. I compute correct conversions between siemens and ohms. The problem is I'm getting different voltage values to the same nodes.

Version-Release number of selected component (if applicable): 

How reproducible:
Create diagrams like attached

Steps to Reproduce:
1. Use dependent and independent current sources and resistors in ohms and siemens

Actual results:
I'm getting different voltage values to the same electrical devices

Expected results:
Getting the same voltage node values

Additional info:
See attachments
Comment 1 Brallan Jesús Aguilar Rivera 2013-08-08 15:26:29 EDT
Created attachment 784568 [details]
Diagram using siemens units

It gives INCORRECT voltage values. The correct are given using resistors with ohm units
Comment 2 Jaromír Cápík 2013-08-09 08:41:54 EDT
Hello Brallan.

AFAIK Qucs never supported conductance and Siemens units. I see you set the resistivity as R = 4S, etc. But that's an invalid input. First of all, the conductance is well known to be marked as G, not R. And the next thing is the field description. It clearly says : 'ohmic resistance in Ohms'. What might be considered a bit confusing is that you get no warning about the invalid input. It simply ignores the appended unit and takes only the numeric part.

I believe there should be validity checks added to the functions processing the input fields.

Please, let me know what you think.

Comment 3 Brallan Jesús Aguilar Rivera 2013-08-09 14:45:57 EDT
In Qucs' getstarted tutorial, page 15 appear same you commented before (I had not seen :s), but also 'Allowed property values' where include siemens. Sorry, but is a little confusing 

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