Bicycle Dynamo Light Circuit: Understanding the Wiring and Functionality

[Physicsissuef]

Hello!

I have one question. How the circuit of the dynamo light of bicycle is closed? Isn't the coil got two wires, one from the start, and one from the end.

Thank you.

Regards.

Here is one picture:

http://www.windpower.org/kres/dynbde04.gif

 

[uart]

The circuit is completed through the bike frame. When you attach the lamp and the generator you'll notice they both include a sharp "pointy" screw designed to penetrate the paintwork and make solid electrical connection to the metal frame.

 

[Physicsissuef]

The circuit is completed through the bike frame. When you attach the lamp and the generator you'll notice they both include a sharp "pointy" screw designed to penetrate the paintwork and make solid electrical connection to the metal frame.

And what happens with the other end of the coil?

 

[turbo]

And what happens with the other end of the coil?

The other end of the coil is grounded to the body of its housing, and the circuit uses the metal frame as a return path to the grounded body of the lamp housing.

 

[moe_3_moe]

what is the maximum of a dynamo energy production.