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Basic Phasors

  1. Feb 25, 2017 #1
    1. The problem statement, all variables and given/known data
    Hi,

    I'm revisiting phasors again. This is one of the topics I've always struggled with. Every time I do a new module, they change a lot of the convention. I've been using Schaums outline of electric circuits recently to get refreshed. I'm just confused on this one part:

    1bde9ee10f.png

    2. Relevant equations


    3. The attempt at a solution

    My question is with the w that appears in the forumla for VL. I understand that the current was differentiated to -sin and I understand that L is the inductance from the inductor voltage equation and that I is the amplitude from the current, but where is the w(omega, frequency) coming from at the front?
     
  2. jcsd
  3. Feb 25, 2017 #2

    blue_leaf77

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    Do you know what the first derivative is of ##\cos(ax)## with respect to ##x## with ##a## being a constant?
     
  4. Feb 25, 2017 #3
    -asin(ax). I see now. Quite stupid of me. Guess I just got confused when we're using actual AC signals and not x. Cheers
     
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