Bicycle Dynamo Light Circuit: Understanding the Wiring and Functionality

  • Context: High School 
  • Thread starter Thread starter Physicsissuef
  • Start date Start date
  • Tags Tags
    Dynamo Lamp
Join the discussion
Ask a follow-up here, or get your own question answered by working scientists, mathematicians and engineers — people, not an autocomplete.
Real named experts · corrections over time · the nuance an AI answer skips
Sign up Log in
4 replies · 8K views
Physicsissuef
Messages
908
Reaction score
0
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
 
Last edited by a moderator:
Physics news on Phys.org
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.
 
uart said:
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?
 
Physicsissuef said:
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.
 
what is the maximum of a dynamo energy production.