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Home Fundamentals A.C. Circuits Power Factor  
See also: Heating Effects of Currents, Measurement of Power Output  
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Power FactorAuthor: J.B. Hoag The power (watts) lost as heat in an a.c. circuit occurs in the resistance alone and is equal to I^{2}R. The power consumed in d.c. circuits is given by EI (volts · amperes). This product, in a.c. circuits, may be several times the actual power lost. The power factor of an a.c. circuit is defined by


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