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How can I collect power from a magnetic field?

  1. Nov 7, 2009 #1
    Im think of making a device that could harness power from a magnetic field, I hardly know any physics. Now my problem is how or what can I use or make to collect the energy from the magnetic field and turn it into power? and so it can run from a solar panel or wind energy?

    plz help looking for ideas if possible to make ty.

  2. jcsd
  3. Nov 7, 2009 #2


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    Staff: Mentor

    Welcome to PF.

    Your questions do not make much sense. What magnetic field? For example, an electric generator converts mechanical energy to electrical energy using a magnetic field: http://en.wikipedia.org/wiki/Electrical_generator

    And what does this have to do with solar and wind energy?

    Perhaps you could rephrase your questions?
  4. Nov 7, 2009 #3

    Jonathan Scott

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    Gold Member

    A static magnetic field doesn't have any power. You can of course take magnetic stuff which is a long way from a magnet, move it closer and extract the power, but once that's used up you have to find more stuff, and you can't put the original stuff back without supplying the energy again, regardless of the level of ingenuity involved in the mechanism.

    For an analogy, consider the gravitational field of the Earth. You can't extract power from that either. You can of course let the sun move water to a high reservoir then let it fall under gravity through a hydroelectric plant, but then you are not extracting energy from the gravitational field but rather from the sun.
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