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!

Homework Help: [signal]phasor addition rule

  1. Oct 28, 2011 #1
    1. The problem statement, all variables and given/known data
    Define x(t)=5cos(wt)+5cos(wt+120)+5cos(wt-120)

    simplify x(t) into the standard sinusoidal form:x(t)= A cos(wt+phase).Use phasors to do the algebra.

    2. Relevant equations

    3. The attempt at a solution
    i know it needs to use phasor addition rule.
    First,i represent x1(t),x2(t),x3(t) by the phasors,and then add them together
    however the result is 0,then i dont know to do

    thanks a lot:))
    Last edited: Oct 28, 2011
  2. jcsd
  3. Oct 28, 2011 #2


    User Avatar
    Homework Helper

    Correct x(t), please!

  4. Oct 28, 2011 #3
  5. Oct 28, 2011 #4


    User Avatar
    Homework Helper

    The result is really zero. So write x(t)=0.

Share this great discussion with others via Reddit, Google+, Twitter, or Facebook