sciencetalk

Wat is de truuk van dit apparaat? Lijkt een perpetuum mobile...
 
https://www.facebook.com/video.php?v=782168861832254&fref=nf

Cool gemaakt!

De truc staat uitgelegd in een van de comments op de Facebook-pagina:
 
The oscillations of the magnets at the beginning prove that there is initially a magnetic field. No magnetic field, no oscillations. This is not the one of the magnets (that turns with the magnet). This is not a parasitic magnetic field, considering the oscillation speed (hence the strength of the magnetic field). Moreover, the equilibrium position of the magnet is – would you believe! – aligned with the coils.
This magnetic field is thus produced by the coils. Coils do not create a magnetic field without electrical current. (Without such a current, they are just a stack of copper.) This prove that there is yet an electrical current before the generator is “started”.
About the LEDs lighting: They are put in parallel with the coils. In a constant magnetic field and for a constant current, coils act like wires: the LEDs are short-cut. However, when moving, the magnetic field of the magnets impact the impedance of the coils. At some points, they no longer short-cut the LEDs, allowing the latter to get some current

Aan het eind van de video staat een diagram hoe het precies in elkaar zit. Dat ziet er wat mij betreft plausibel uit, leuk om een keer te bouwen.

Er zitten gewoon een paar batterijen in de klosjes.
Daar komt de energie vandaan die dit ding aan het draaien houdt.