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Anonymous Poster

Complex Power

07/02/2010 3:48 PM

Power=P+P(cos(2wt))+Q(cos(2wt))

,but

Complex Power = P+jQ

Am I to assume that complex power is a phasor representation of the last two terms? Why does this formula ignore the first term?

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Anonymous Poster
#1

Re: Complex Power

07/02/2010 8:37 PM

and aparently it is also equal to

complex power =(Veff)(Ieff)

which is a scalar, but its also equal to

complex power=(Vphasor)(Iphasor)/2

which is a phasor

how can complex power be both a phasor and a scaler?

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Anonymous Poster
#2

Re: Complex Power

07/02/2010 10:20 PM

I think you have some how mixed up your formulaes.

The power is phasor, and is the phasor multiplication of two phasors ie V and I.

All other things are the approximation/mathematical expansion of these.

Start with phasor representations of v and I's in terms of the wt and Φ and then derive the mathematics and you know.

BTW why didn't you ask your professor?

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Anonymous Poster
#3
In reply to #2

Re: Complex Power

07/02/2010 10:43 PM

i dont have a professor just a text book

its right here http://en.wikipedia.org/wiki/AC_power

search in that page for complex power, it makes sense as a phasor, but im looking at it right now in my book it says that complex power S=(Veff)(Ieff) which is a scaler

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Anonymous Poster
#4

Re: Complex Power

07/02/2010 11:33 PM

o wait i got it im sorry u were right, my text tricked me with some sneaky notation

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