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Homework Help: What does the unit hp means?

  1. Jun 24, 2012 #1
    What does the unit "hp" means?

    I admit that my physics sucks because it has been a long time since I heard the word "physics" but putting that aside, what does the unit "hp" represent/means? I don't remember learning that unit in school.

    Eg. An engine develops 85hp

    I'm guessing it's a Power unit and if it is, would it be like 85 hp = 8500 watts/J? or would it just be 85hp?
    Last edited: Jun 24, 2012
  2. jcsd
  3. Jun 24, 2012 #2


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    Staff: Mentor

    Re: What does the unit "hp" means?

    hp = horsepower. Exactly how big it is depends on the horse. :biggrin:


    Google Calculator gives a value of 1 hp = about 746 watts.
  4. Jun 24, 2012 #3
    Re: What does the unit "hp" means?

    Thank you very much for replying! :smile:
  5. Jun 24, 2012 #4
    Re: What does the unit "hp" means?

    1 horsepower = 550 ft-lb/sec.
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