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Odd phenomena with an induction cooktop

  1. Oct 2, 2014 #1
    I have a new induction cooktop. I bought a pan rated for induction cooking for the stove and placed it over a burner while the stove was turned off. These pans tend to be rather heavy and the capacity of this pan was 3 qts. It had two handles, one was long and straight and the other was curved. Here is a link to a picture of the pan. You will need to select "3 qt" to see the pot. http://www.williams-sonoma.com/prod...c=cookware-williams-sonoma||NoFacet-_-NoFacet-_--_-

    When I touched the curved handle, called the loop handle, I felt when seemed to be a vibration or an electric current. I did this several time with both hands and later my hands seemed to ache a bit. I thought this was pretty odd, especially since the power was supposedly off. I was sufficiently spooked that I did not test this with the power on. This has not happened with any of the other pans I am using on the cooktop.

    I believe the induction heating process works when the electric current in the burner creates a powerful magnetic field in the pan which in turn induces an electric current in the pan and the ohmic resistance of the material causes the pan to heat up. I read that you are not supposed to use metal cooking utensils in pans on the induction stove. Also, you need to stand at least 30 cm away from the stove when cooking. Of course for short periods, you may be closer but supposed this is not a health risk.

    So my questions are:
    1- Is there a way to measure the current (if any) flowing in the handle of the pot?
    2- Is there a way to measure any EMFs when the stove is both off and on?
    3- Can anyone explain the cause of this phenomena?
  2. jcsd
  3. Oct 2, 2014 #2


    Staff: Mentor

    Hi socalgranny, welcome to PF!

    I hope you enjoy your induction cook top, we have really enjoyed ours.

    The induction stove top has a rather large power supply which converts the low frequency power from the wall into the high frequency power required by the induction elements. Generally, any acoustic noise or vibrations that you hear or feel will come from the power supply. If it is relatively low pitch (buzzing) then it is probably from the fan that cools the power supply. If it is relatively high pitch (ringing) then it is probably from the output somewhere.

    Sometimes, if a particular pan has an acoustic resonance near the output frequency you can hear ringing from the pan rather than the stove.
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