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# How does a dynamo work? watch

1. I've got a bit confused with this. Is there a rotating magnet within a coil or is it like an alternator with a coil rotating between two magnets?
It's for my A2 Physics coursework

cheers for any help
2. I believe it is to do with the motor effect - Flemings LHR

The dyanamo is a rectangular frame and current passes through it. Some of this current acts perpendicular to the magntic field so it has no force on it. The other sides act perpendicular to the field and the current go in oppose it directions on each side. The means that there are two forces acting on the frame.

One forces the 'left' side down and the other forces the 'right' side down. This causes the motor to spin. (because the currents are going in opposite directions).

Eventually this effect will leave the frame in a state of equilibrium where it is perpendiculal to the magnetic field. To stop this from happening split ring communtators reverse the current (making it AC) and the frame continues to spin.

I think that is the jist of it?

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Updated: April 11, 2011
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