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Sci.Electronics.Basics -> Calculating total resistance?
There are 3 messages in this thread.
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Author: tomixDate: 06:27 07-06-08
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Hi,
I am looking for an algorithm for calculating total resistance of a
circuit.
The circuit is repersneted using a graph where every edge represent a
resistor.
Thanks in advance
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Author: VaractorDate: 06:59 07-06-08
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On Jun 7, 10:27=A0pm, tomix <tome...@hotmail.com> wrote:
> Hi,
>
> I am looking for an algorithm for calculating total resistance of a
> circuit.
>
> The circuit is repersneted using a graph where every edge represent a
> resistor.
>
> Thanks in advance
No algorithm needed. Just start at the input and output and use the
series/parallel formula up to common nodes.
Cheers
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Author: John LarkinDate: 13:51 07-06-08
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On Sat, 7 Jun 2008 03:27:25 -0700 (PDT), tomix <tomerdr@hotmail.com>
wrote:
>
>Hi,
>
>I am looking for an algorithm for calculating total resistance of a
>circuit.
>
>The circuit is repersneted using a graph where every edge represent a
>resistor.
>
>
>Thanks in advance
Google "circuit mesh analysis" or "circuit node analysis." The
general
method is to write a heap of loop equations and solve; it's
essentially a matrix analysis thing.
http://en.wikipedia.org/wiki/Mesh_analysis
Real engineers seldom or never do this. Relatively simple circuits can
be solved by ad-hoc techniques, reducing series and parallel branches.
Anything more complex, it's easier to just crank up LT Spice.
There are simple iterative numerical methods to solve a general
resistor network, but they are compute-intensive, so you may as well
use Spice.
I prefer to design things that are easy to analyze. One often has that
option. With opamps being so cheap these days, it's easy to
orthogonalize things instead of making a minimal-components hairball.
John
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