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Inductance of DC Electromagnet Coil. Help!

  1. Aug 12, 2013 #1
    I am trying to make a DC electro magnet coil. The Coil is wound up to the core. And works fine. But i'm not being able to find out the inductance of the coil. The Resistance of Coil R20= 490 ohms. Impedence is 523 Ohms. 110v give .21 amps. Please Help.
  2. jcsd
  3. Aug 12, 2013 #2
    Is the 110v alternating or direct current? If alternating current, what is its frequency?
  4. Aug 12, 2013 #3
    That is not correct, you need to know the frequency as has been hinted at. XL = ωL
  5. Aug 12, 2013 #4
    You say 110volts so I would guess that f = 60Hz (or maybe 50Hz)
    The impedance = 110/0.21 = 523Ω. ω Is 2∏60 = 377
    So if you do 5232 = 4902 + (ωL)2......see what you get for L.
  6. Aug 12, 2013 #5
    sure. that's why i deleted my posting - not fast enough...
    L measures in H ,-)
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