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[signal]phasor addition rule

  • Thread starter smallwa
  • Start date
  • #1
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Homework Statement


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.


Homework Equations





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:

Answers and Replies

  • #2
ehild
Homework Helper
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Homework Statement


Define x(t)=5cos(wt)+5cos(wt=120)+5cos(wt-120)
Correct x(t), please!


ehild
 
  • #3
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Correct x(t), please!


ehild
sorry,corrected
 
  • #4
ehild
Homework Helper
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The result is really zero. So write x(t)=0.

ehild
 

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