Wye vs. Delta — Where the √3 Actually Comes From

Two ways to wire three windings together — and why one multiplies voltage by 1.732 while the other multiplies current by it instead.

Every three-phase transformer or motor winding set can be connected two ways: wye (star) or delta. Ask why √3 (≈1.732) shows up in the line-voltage or line-current formula and most people will say "it's just the constant for three-phase." It isn't arbitrary at all — it falls directly out of adding two voltages, or two currents, that are 120° apart in phase. Once you see that one triangle, wye and delta stop being two things to memorize and become the same geometric fact applied to two different physical layouts.