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Joule   /dʒul/   Listen
Joule

noun
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.  Synonyms: J, watt second.
2.
English physicist who established the mechanical theory of heat and discovered the first law of thermodynamics (1818-1889).  Synonym: James Prescott Joule.






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"Joule" Quotes from Famous Books



... given quantity of heat energy. Mechanical energy is generally represented by some unit of weight and height, such as the foot-pound; and heat energy is represented by a given weight of water heated a given amount, such as a pound-degree centigrade. Joule's equivalent is usually accepted; it states that 772.55 foot pounds of mechanical energy are equivalent to 1 pound-degree F. (one pound avds. of water raised in temperature one degree Fahrenheit). Other equivalencies have ...
— The Standard Electrical Dictionary - A Popular Dictionary of Words and Terms Used in the Practice - of Electrical Engineering • T. O'Conor Slone

... that hitherto the practical answer made to us by existing machines is, 'No;' there is always a great waste due to the heat spoken of above. But, fortunately, we have faith in the measurements, of which I have already spoken, in the facts given us by Joule's experiments and formulated in ways we can understand. And these facts tell us that in electric machines of the future, and in their connecting wires, there will be little heating, and therefore little loss. We shall, I believe, at no distant date, ...
— Scientific American Supplement, No. 288 - July 9, 1881 • Various

... As determined by Joule, heat energy has a certain definite relation to work, one British thermal unit being equivalent from his determinations to 772 foot pounds. Rowland, a later investigator, found that 778 foot pounds were a more exact equivalent. Still later investigations indicate that ...
— Steam, Its Generation and Use • Babcock & Wilcox Co.

... through a conductor whose ends differ in potential by one volt, or, in other words, the rate of doing work when an ampere passes through an ohm. It is equal to ten million, 10^7, C. G. S. units of power or ergs per second, that is to say, to a Joule per second, or ...
— The Story Of Electricity • John Munro



Words linked to "Joule" :   energy unit, physicist, heat unit, erg, work unit



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