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Alternating current

  1. Feb 5, 2008 #1
    1. The problem statement, all variables and given/known data
    A light bulb is connected to a 120.0-V wall socket. The current in the bulb depends on the time t according to the relation I = (0.669 A) sin [(491 Hz)t].

    What is the frequency of the alternating current?


    2. Relevant equations
    How do I use the given value for I?? (since it includes time, t)


    3. The attempt at a solution
    I know that V=Vo * sin2pi * freq * time
     
  2. jcsd
  3. Feb 5, 2008 #2

    mezarashi

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    Homework Helper

    The only relevant equation you should be using is:

    sin(kt)

    Suppose I have the equation sin(pi*x), can you tell me what the period of this function is? Can you tell me the frequency? Draw it out. Now if I tell you I have the equation sin(491*x), can you tell me the same information?

    You will notice a pattern such as: sin(k*x) -> sin(2*pi*f*x) in terms of frequency.
     
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