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Homework Help: Simple AC circuit theory problem

  1. Nov 4, 2008 #1
    1. The problem statement, all variables and given/known data

    It's a simple AC circuit with a 100ohm resistor and a 10mH inductor connected in series. The voltage is given as a function rather than a quantity: V = 20sin (5000t).

    Problem asks to find the peak current in the circuit.

    2. Relevant equations

    i = integral (V/L)dt
    Z = sqrt (R2 + XL2

    3. The attempt at a solution

    Is it as simple as saying the peak voltage is 20V and the frequency is f = 5000/2pi , and then solving it like a normal AC circuit? Or is any integration required, or anything similar? Im quite clueless, any help would be appreciated thanks :)
  2. jcsd
  3. Nov 4, 2008 #2


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    Welcome to PF.

    Looks like you are on the right track, assuming you know how to calculate XL for the inductor.
  4. Nov 5, 2008 #3
    thanks i've got it... I = V/Z... z= r+j(wl).. just didnt realize it's that simple.
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