POWER TRIANGLEBasic AC PowerSummaryAC power relationships are summarized below.AC Power Relationships SummaryObserve the equations for apparent, true, and reactive power, and powerfactor:- Apparent power (S) = I^{2}Z = I_{T}E- True power (P) = I^{2}R = EI cosq- Reactive power (Q) = I^{2}X = EI sinq- Power factor (pf) = = cosqPSFrom observation, you can see that three power equations have the angle q incommon. q is the angle between voltage and current. From this relationship,a power triangle, as shown in Figure 1, is formed.ELI the ICE man is a mnemonic device that describes the reactivecharacteristics of an AC circuit.- Current (I) lags voltage (E) in an inductive circuit (L)- Current (I) leads voltage (E) in a capacitive circuit (C)ES-09 Page 16 Rev. 0

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