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Homework Help: RL Phase Angle

  1. Jul 15, 2011 #1
    1. The problem statement, all variables and given/known data

    In the circuit shown, the AC voltage source supplies an rms voltage of 115 V and the circuit has R1 = 3.35 kΩ and L = 39 mH.

    a) At what frequency will the rms current be 31.33 mA (milliamperes)?

    2. Relevant equations

    irms=vrms / XL

    3. The attempt at a solution

    Did you remember to convert from ω to f?[PLAIN]https://wug-s.physics.uiuc.edu/cgi/courses/shell/common/showme.pl?cc/DuPage/Phys1202/summer/homework/Ch-23-24/RL_phase/RL.jpg [Broken]
    Last edited by a moderator: May 5, 2017
  2. jcsd
  3. Jul 15, 2011 #2
    do you know the formula relating Irms, Vrms, Z (impedance) ?
    use that ...
  4. Jul 15, 2011 #3
    Z= (sqrt R^2 + XL^2) = (sqrt R^2 +(wL)^2)
    Vrms,R = IrmsR
    Vrms,L = IrmsXL = Irms(wL)
    wL= 2pi*f*L

    these are the formula i used and i solve for f thanks for the help
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