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Science Forum Index » Electronics - Basics Forum » Calculating total resistance?...
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| tomix... |
 Posted: Sat Jun 07, 2008 12:27 am |
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Guest
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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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| Varactor... |
| Posted: Sat Jun 07, 2008 12:59 am |
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Guest
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On Jun 7, 10:27 pm, tomix <tome... at (no spam) hotmail.com> wrote:
Quote: 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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| John Larkin... |
| Posted: Sat Jun 07, 2008 12:51 pm |
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Guest
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On Sat, 7 Jun 2008 03:27:25 -0700 (PDT), tomix <tomerdr at (no spam) hotmail.com>
wrote:
Quote:
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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