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Delta–to–Wye (Δ–Y) equivalent circuits: what, how, and why. 1. What Δ and Y networks actually are How the two interconnections differ and what it means for them to be electrically equivalent in terms of node relationships and terminal resistances. 2. How the transformation formulas are derived A close look at the relationships between branch resistances and how we arrive at the Δ→Y equations from basic circuit principles. 3. Why this matters The Δ–Y conversion is a powerful tool for simplifying