Some devices that has only 1 wire! Eh?

Discussion in 'General Electronics Chat' started by Lightfire, May 30, 2011.

  1. Lightfire

    Thread Starter Well-Known Member

    Oct 5, 2010
    690
    21
    Hello,

    I looked at my dad's bicycle and saw that there is only 1 wire there! I mean the lamp in my dad's bicycle has only 1 wire! And I don't know how it is being lighted as there is no battery!:eek:

    OK, general question. How does a lamp or any other devices that has only 1 wire will work?:cool:
     
  2. magnet18

    Senior Member

    Dec 22, 2010
    1,232
    124
    It has 2 wires, one of them is just disguised as the frame of the bike itself :D
    Since it's metal it can be used as the ground and save on wire.

    It's probably powered by a device similar to a small generator powered by the spinning of the wheels or the pedals.
     
    Lightfire likes this.
  3. Lightfire

    Thread Starter Well-Known Member

    Oct 5, 2010
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    Thank. :)

    Lightfire
     
  4. debjit625

    Well-Known Member

    Apr 17, 2010
    790
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    Its called Bicycle Dynamo
    Read the dynamo section :http://en.wikipedia.org/wiki/Bicycle_lighting
     
  5. Lightfire

    Thread Starter Well-Known Member

    Oct 5, 2010
    690
    21
    Thank

    Lightfire
     
  6. mbohuntr

    Active Member

    Apr 6, 2009
    413
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    Hi catapult! Your English is getting much better!! "Thank" should be changed to "Thank you" Keep asking the questions ! Your doing well. ;)
     
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  7. Lightfire

    Thread Starter Well-Known Member

    Oct 5, 2010
    690
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    :D :D

    OK

    Thank you.:D
     
  8. mbohuntr

    Active Member

    Apr 6, 2009
    413
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    Perfect! Well done!
     
  9. Jaguarjoe

    Active Member

    Apr 7, 2010
    770
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    I had a few one wire electricians working for me over the years:)
     
  10. DerStrom8

    Well-Known Member

    Feb 20, 2011
    2,428
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    The "one wire" idea is not limited to bicycles, either. It is commonly used in motorcycles, cars, boats, and just about any other vehicle that has an electrical system. The "negative" is usually just the frame of the vehicle itself (except for a few automobiles that are positive-grounded, and the "positive" is the frame).
    Der Strom
     
  11. Wendy

    Moderator

    Mar 24, 2008
    20,766
    2,536
    It is related strongly to the ground discussion we had a while back.
     
  12. Laird Scooby

    New Member

    May 31, 2011
    11
    0
    I tend to agree with all of what you've just said except for boats! With a fibre-glass hulls, there's no metal to provide the earth return and with metal hulls they avoid using the hull due to electrolytic corrosion. I remember sending my apprentice to pull the fuses for one circuit on a boat one day then hearing him swear as he caught a jolt. Sure enough he'd only pulled the live fuse and left the neutral fuse behind, leaving the neutral line floating at 120Vac WRT earth! (It was a 240Vac system).

    Sometimes i must admit the frame/skid/chassis that something like an engine is in will be used as an earth return in a boat but only as the earth return for that particular item/assembly and it will be isolated from the ships hull for the reason stated above.

    Hope this helps!
     
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