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Homework Help: Sinusoidal current phase angle question

  1. Nov 28, 2011 #1
    1. The problem statement, all variables and given/known data

    The sinusoidal current i1(t) has a phase angle of 60 degrees. Furthermore, i2(t) attains its positive peak 0.25ms earlier than the current in i2(t) (i.e i1(t) leads i2(t)). Both currents have a frequency of 500 Hz. Determine the phase angle of i2(t)

    2. Relevant equations

    I think we would use this equation: v1(t) = V1cos(wt + theta1)

    3. The attempt at a solution

    I just cant find a formula in t he book that adds both currents in order to obtain the missing phase angle. Much help is appreciated!
  2. jcsd
  3. Nov 28, 2011 #2


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    Staff: Mentor

    You won't need a 'canned' formula for this problem. The first thing to determine is what fraction of a whole wave period does 0.25ms represent? What's the period of the sinusoids?
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