1. Limited time only! Sign up for a free 30min personal tutor trial with Chegg Tutors
    Dismiss Notice
Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Quick question on 3 phase before my final

  1. Apr 27, 2008 #1
    Quick question on 3 phase before my final!!

    1. The problem statement, all variables and given/known data

    In equations for 3 phase power there is an angle that is mentioned, but I dont know if this is the angle of the impedance or another angle. Im a little confused. The equations are below.

    2. Relevant equations

    Any help?
  2. jcsd
  3. Apr 29, 2008 #2


    User Avatar
    Science Advisor
    Homework Helper
    Gold Member

    I'm certainly not an electrical expert, but the angle you are referring to is the phase angle betwen the voltage and the current, where [tex]cos\theta = power factor[/tex]. For purely resistive loads, theta is 0, hence the power factor is unity, and there is no reactive power Q. However, I don't quite understand your equation, since typically ,for power transmsission, [tex] P= \sqrt3(V)(I)cos\theta [/tex]. That's about it for my electrical knowledge.
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook

Similar Discussions: Quick question on 3 phase before my final
  1. 3 phase AC question (Replies: 1)