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Thread: AC formulae and power analysis etc

  1. #11
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    Quote Originally Posted by Besoeker View Post
    Nice cut and paste job (twice)....
    It was only pasted once. The Forum software chooses to do the double display for some image types and sizes.

  2. #12
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    Quote Originally Posted by GoldDigger View Post
    It was only pasted once. The Forum software chooses to do the double display for some image types and sizes.
    Whatever. It was a cut and paste with no other input that I can see from the OP. My question remains........
    Si hoc legere scis nimium eruditionis habes.

  3. #13
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    Quote Originally Posted by Ingenieur View Post
    No it's the symbol for the conjugate of the qty
    like '!' is the symbol for factorial

    if you had phasor analysis you used conjugate

    S = V (conjugate of I) = V I*


    Makes sense now, thank you for clearing up my misunderstanding
    What is esoteric knowledge today will be common knowledge tomorrow.

  4. #14
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    [QUOTE=GoldDigger;1858999]
    Quote Originally Posted by Julius Right View Post
    Yes he did!
    Actually, the resulting Q2 is always positive, allowing Q to be either positive or negative.

    If you do simple complex multiplication without the conjugate you get a negative value for
    q2, which is impossible, and you get cross terms which still contain j, also unphysical for power.
    incorrect
    Xc = -j
    Xl = j
    the sign convention for reactance takes care of that



  5. #15
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    [QUOTE=Ingenieur;1859026]
    Quote Originally Posted by GoldDigger View Post

    incorrect
    Xc = -j
    Xl = j
    the sign convention for reactance takes care of that
    This applies to all forms or just vector?
    What is esoteric knowledge today will be common knowledge tomorrow.

  6. #16
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    [QUOTE=mbrooke;1859027]
    Quote Originally Posted by Ingenieur View Post

    This applies to all forms or just vector?
    polar (vector/phasor) or rectangular (complex form Re + Img j)



  7. #17
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    [QUOTE=Ingenieur;1859054]
    Quote Originally Posted by mbrooke View Post

    polar (vector/phasor) or rectangular (complex form Re + Img j)
    What is esoteric knowledge today will be common knowledge tomorrow.

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