Unformatted text preview: pf = cos θ = R/(R 2 + X 2 ) 1/2 , 1 ≥ pf ≥ 0. If θ > 0 (inductive impedance), θ i < θ v , pf lagging If θ < 0 (capacitive impedance), θ i > θ v , pf leading If θ = 0 for purely resistive load and the pf is unity Reactive Power (VAR) Q = V rms I rms sin θ = I rms 2 X Apparent Power (VA) S = V rms I rms = I rms 2  Z  = V rms 2 /  Z  Complex Power (VA) S = V rms ( I rms )* = V rms I rms ∠θ = P + j Q = I rms 2 Z = ( V rms ) 2 / Z *...
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 Spring '11
 Staff
 Alternating Current, Impedance, AC power, Vrms Irms

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