Graphs of the Y-Δ transform. Each graph connects the nodes N1, N2, N3; the transform is a simple calculation of the flows through the edges of one graph given the flows through the edges of the other graph. The primary application of the transform is in design and analysis of electrical circuits, but it is a theorem of graph theory, meaning that it can also be applied in other fields.

This image is meant as a replacement of Image:Delta wye circ.PNG.
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