September 2008
Beginner
834 pages
37h 13m
English
Content preview from Electric Circuits and Networks
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8.10 COMPLEX POWER UNDER SINUSOIDAL STEADY-STATE CONDITION
Can we get the P and Q values from the voltage phasor and the current phasor straightaway by multiplying them together? We will try. Let V = Vrms∠φv V rms be the voltage phasor and I = Irms∠φi A rms be the current phasor; both specified as rms quantities. Then,
We are not able to identify P or Q in the real and imaginary parts of this quantity since we know that P = VrmsIrms cos(φv – φi) and Q = VrmsIrms sin(φv – φi), but this observation prompts us to try VI* instead of VI
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