Joule

joule
    n 1: a unit of electrical energy equal to the work done when a
         current of one ampere passes through a resistance of one
         ohm for one second [syn: {joule}, {J}, {watt second}]
    2: English physicist who established the mechanical theory of
       heat and discovered the first law of thermodynamics
       (1818-1889) [syn: {Joule}, {James Prescott Joule}]
    

joule \joule\ (j[=oo]l), n. [From the distinguished English
   physicist, James Prescott Joule (1818-1889).] (Physics.)
   A unit of work which is equal to 10^{7} ergs (the unit of
   work in the C. G. S. system of units), and is equivalent to
   one watt-second, the energy expended in one second by an
   electric current of one ampere in a resistance of one ohm;
   also called the {absolute joule}. It is abbreviated J or j.
   The {international joule} is slightly larger, being 1.000167
   times the absolute joule. The absolute joule is approximately
   equal to 0.737562 foot pounds, 0.239006 gram-calories (small
   calories), and 3.72506 x 10^{-7} horsepower-hours, and
   0.000948451 B.t.u. --HCP61
   [1913 Webster +PJC]

   {Joule's equivalent}. See under {Equivalent}, n.
      [1913 Webster]