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A common problem involves finding the equivalent resistance ( Reqcap R sub e q end-sub ) of a bridge or complex lattice circuit. Example: Reducing a Bridge Circuit Consider a bridge where a Delta network is formed by

RB=RAB⋅RBCRAB+RBC+RCAcap R sub cap B equals the fraction with numerator cap R sub cap A cap B end-sub center dot cap R sub cap B cap C end-sub and denominator cap R sub cap A cap B end-sub plus cap R sub cap B cap C end-sub plus cap R sub cap C cap A end-sub end-fraction

The Delta resistance between two terminals is the sum of the Star resistors connected to those terminals plus their product divided by the third resistor.

), then each Delta resistor is exactly three times the Star value ( 3. Step-by-Step Problem Solving

The following formulas are essential for converting between the two types. Delta to Star Transformation ( Δ→Ycap delta right arrow cap Y