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Conversion of friction energy in to electrical energy is possible?

  1. Nov 2, 2015 #1
    It is possible to convert frictional energy in to electrical energy directly?.... please tell me and if possible give me the formulae...
     
  2. jcsd
  3. Nov 2, 2015 #2

    billy_joule

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    Could you give some more information?

    Some heat engines can convert heat produced by friction directly into electricity:

    https://en.wikipedia.org/wiki/Thermoelectric_generator

    But in almost all cases it's cheaper and easier to reduce friction in the first place rather than try to capture energy lost due to friction (usually very low quality energy)
     
    Last edited: Nov 2, 2015
  4. Nov 2, 2015 #3

    berkeman

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    Welcome to the PF.

    That's what is used for much of the braking in electric vehicles -- are you familiar with "regenerative braking"? :smile:
     
  5. Nov 2, 2015 #4

    rcgldr

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    That uses some part of the drive train using components similar to a generator, and doesn't rely on friction (other than the friction between tires and road that coexists with the torque to drive the drivetrain when it's acting as a generator).
     
  6. Nov 3, 2015 #5

    CWatters

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    Friction is a force not energy. As for equations...

    If you had a block of mass m being dragged along a surface at constant velocity v and the coefficient of friction was u then the power dissipated as heat would be roughly..

    Power = force * velocity = mguv
     
  7. Nov 3, 2015 #6

    berkeman

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    Bingo! Without friction, regenerative braking would not be possible. :smile:
     
  8. Nov 3, 2015 #7

    Merlin3189

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    So without friction would any braking be possible?

    Perhaps we could use air braking, then use the air pressure to drive a turbine to provide regenerative energy.
     
  9. Nov 3, 2015 #8

    David Lewis

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    Friction can produce electricity directly via triboelectric effect, as in a Van de Graaff generator.
     
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