Circuit Theory/Y Δ
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![](//upload.wikimedia.org/wikipedia/commons/a/ac/Example23y.png)
Circuit after Δ Y transformation of top bridge .. can now use parallel/serial combinations rather than source injection to find Thevenin's resistance ![Example23g.png](//upload.wikimedia.org/wikipedia/commons/4/47/Example23g.png)
Example23g.png ![](//upload.wikimedia.org/wikipedia/commons/thumb/c/cb/Wye-delta-2.svg/286px-Wye-delta-2.svg.png)
![](http://upload.wikimedia.org/wikipedia/commons/a/ac/Example23y.png)
The bridge circuit example was solved with source injection, but could have been solved with a Y Δ transformation.
![Example23g.png](http://upload.wikimedia.org/wikipedia/commons/4/47/Example23g.png)
The 5,2 and 3 ohm resistors form a Δ that could be transformed into a Y.
![](http://upload.wikimedia.org/wikipedia/commons/thumb/c/cb/Wye-delta-2.svg/286px-Wye-delta-2.svg.png)
The equations are:
Now Thevenin's resistance can be solved by parallel and serial combinations:
Which is the same value found through source injection.