Basic DC Theory DC CIRCUIT ANALYSISThe network shown in Figure 48 is called p (pi) or D (delta) because the shapes resemble Greekletters p and W. These are different names for the same network.Figure 48p (pi) or D (delta) NetworkIn order to analyze the circuits, it may be helpful to convert Y to D, or D to Y, to simplify thesolution. The formulas that will be used for these conversions are derived from Kirchhoff’s laws.The resistances in these networks are shown in a three-terminal network. After we use theconversion formulas, one network is equivalent to the other because they have equivalentresistances across any one pair of terminals (Figure 49).D to Y conversion:RaR1R3R1R2R3RbR1R2R1R2R3RcR2R3R1R2R3Rule 1: The resistance of any branch of a Y network is equal to the product of the twoadjacent sides of a D network, divided by the sum of the three D resistances.Rev. 0 Page 61 ES-02
Integrated Publishing, Inc. - A (SDVOSB) Service Disabled Veteran Owned Small Business