Calculating total resistance?
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Posted by tomix on June 7, 2008, 6:27 am
Please log in for more thread options 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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Posted by Varactor on June 7, 2008, 6:59 am
Please log in for more thread options 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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Posted by John Larkin on June 7, 2008, 1:51 pm
Please log in for more thread options wrote:
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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 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 | ||||||||||||||||
>
> 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