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Homework Help: Urgent question but simple problem

  1. Dec 4, 2008 #1
    Urgent question but simple problem:Phase difference

    1. The problem statement, all variables and given/known data
    What is the phase relationship between voltage and current?
    i = 5sin(wt+30)
    V = 10sin(wt+140)

    2. Relevant equations

    3. The attempt at a solution
    it seems that drawing using cartesian, the voltage is leading the current by 110 degrees

    but the correct answer is i leads v by 110 degrees why is that?
    i thought the arrow with higher angle leads the lower angle
    Last edited: Dec 4, 2008
  2. jcsd
  3. Dec 4, 2008 #2
    is it because the maximum limit of 90 degress phase difference is exceeded?

    another example:
    V = 2sin(wt+10)
    i = sin(wt+210)

    voltage leads current by 200 degrees?
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