Eddy currents are built up by passing a conductive material such as copper, aluminum, etc. through an alternating magnetic field. This can be an electro-magnetic or permanent magnetic field. The faster you move the conductive material, the stronger the resistance to that movement becomes because you are building more current. If you stay at a constant rpm, you will have a constant resistance. At zero rpm, you will have no resistance because you are not building any Eddy Current. Other factors that increase the resistance are the strength of the magnets and how close the conductive material is to the alternating magnetic field. The materials will however, build up a lot of heat during the process due to the resistance between the magnets and the conductive material. I have built several at work with permanent rare earth magnets that get so hot, you can't touch the surface of the metal. John ............................................. To unsubscribe go to http://www.sayegh.org/unsubscribe.htm .............................................
