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Math Help - complex numbers problem can someone explain where im going wrong?

  1. #1
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    can someone explain where im going wrong?

    V=40+i35volts
    I=6+i3amps
    i have worked out that the phase difference between V and I is A= 14.6degrees

    converted V and I into polar form V= 53.2/41.2degrees I=6.8/26.6degrees now find the power(watt) Power=(V) X( I )X (cosA)

    (V)X(I)=361/67.8degrees in polar form


    can anyone please explain how i multiply a polar number by cos14.6 or have i gone wrong somewhere?
    Last edited by rich1979; August 15th 2012 at 08:46 PM.
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