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Apparently in the UK, there is also a DIY Induction magnetic bicycle light kit.
No Batteries - Ever! No Friction! No Batteries - Ever! No Friction! No Resistance!!
Quote from: CliffordK on 30/07/2013 21:27:08Apparently in the UK, there is also a DIY Induction magnetic bicycle light kit.Quote from: http://freelights.co.ukNo Batteries - Ever! No Friction! No Batteries - Ever! No Friction! No Resistance!!Even if there really was "No Friction!", (which isn't true) , there would still be resistance to motion,
A educational kit for investigating electrical generator in schools and colleges.
... RD, perhaps you should write a letter to them and set them straight.
Note: Some people wrote to us, saying they do not believe there is no drag in this dynamo. Technically, there is a drag force but only between the two magnets. Unlike typical dynamos there is no scraping against the tire to slow down the bike itself. On a real bicycle, even the drag force between the two magnets is too small to be detected
The electromagnetic drag could be “detected” by turning the bike upside down, allowing the front wheel to come to rest , rotating it 180 degrees, letting it go and timing how long the oscillations took to die away , with and without a magnet attached, [ should replace the magnet with a non-magnetized bit of metal of the same size and weight for a fair comparison ].