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Reoccurring Error in RLC Series Circuit Problems.

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buildingblocs
#1
Nov6-13, 01:12 AM
P: 11
Hi All,

In doing some practice RLC series circuit question, I have been obtaining incorrect values for active and reactive power. The magnitudes I obtain are correct however the sign of the value is not. I have attributed this to obtaining an incorrect argument for the absolute power, or computing phasors incorrectly. I have attached an image of the reasoning behind my problem solving however I must be fundamentally wrong somewhere.
Attached Thumbnails
Question_3.png  
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Babadag
#2
Nov14-13, 03:39 PM
P: 44
S=V.I*=(V.ejα).(I.ejβ)*= (V.ejα).(I.e − jβ)= V.I.ej(α − β) = VIcos(α − β) + j.VIsin(α − β)
I*=conjugated electric current α=θv ; β=θv-θz ;α-β=θz
Then S=V^2/Z.ejθz
Attached Thumbnails
Question_3a.jpg  


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