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How can i calculate the resistance of this electromagnet?

  1. Jul 8, 2015 #1
  2. jcsd
  3. Jul 8, 2015 #2

    berkeman

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    Staff: Mentor

  4. Jul 8, 2015 #3
    The ebay post says the electromagnet uses 5 watts, can i plug that into the equation, 5 watts = 12 volts^2 / Resistance ??
     
  5. Jul 8, 2015 #4

    berkeman

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    Staff: Mentor

    Yeah, good idea. :smile:
     
  6. Jul 8, 2015 #5
    Current is listed as 0.42A in the specs. So you could also divide voltage by current (simple ohms law). Same result.
     
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