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Complete the power triangle

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  1. jfoster is offline Junior Member Pro Subscriber
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    Complete the power triangle

    Complete the power triangle given 127.58 VAR and 150.11 VA

    79.1 W, 58.2 PF

    127.49 W, 31.79 PF

    49.02 W, 31.79 PF

    79.1 W, 49.02 PF

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    I believe the correct answer should be 79.1 watts, 52.7 power factor.

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    Kalbi_Rob is offline Experienced Member Pro Subscriber
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    Quote Originally Posted by jfoster View Post
    Complete the power triangle given 127.58 VAR and 150.11 VA

    79.1 W, 58.2 PF

    127.49 W, 31.79 PF

    49.02 W, 31.79 PF

    79.1 W, 49.02 PF

    Mark For Later Review

    I believe the correct answer should be 79.1 watts, 52.7 power factor.
    You might want to check your work for the power factor portion, but
    I think they shouldn't call it PF but the angle since cos of theta is 0 - 1, not 58.2
    answer I would select is 79.1 W, 58.2 PF

    P=sqrt((150.11^(2))-(127.8^(2)))= 79.1 W
    sin^(-1)(127.58/150.11) = 58.2 degrees

    PF = cos(58.2) = 0.5269 = 0.53

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    Quote Originally Posted by Kalbi_Rob View Post
    You might want to check your work for the power factor portion, but
    I think they shouldn't call it PF but the angle since cos of theta is 0 - 1, not 58.2
    answer I would select is 79.1 W, 58.2 PF

    P=sqrt((150.11^(2))-(127.8^(2)))= 79.1 W
    sin^(-1)(127.58/150.11) = 58.2 degrees

    PF = cos(58.2) = 0.5269 = 0.53
    Question has been updated to reflect the angle rather than PF.

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