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power, in physics

(Encyclopedia)power, in physics, time rate of doing work or of producing or expending energy. The unit of power based on the English units of measurement is the horsepower, devised for describing mechanical power b...

Prescott, city, United States

(Encyclopedia)Prescott, city (1990 pop. 26,455), alt. 5,389 ft (1,643 m), seat of Yavapai co., central Ariz. in a mineral-rich area; inc. 1883. It is a mining and ranching center, a summer resort, and the headquart...

thermoelectricity

(Encyclopedia)thermoelectricity, direct conversion of heat into electric energy, or vice versa. The term is generally restricted to the irreversible conversion of electricity into heat described by the English phys...

watt

(Encyclopedia)watt [for James Watt], abbr. W, unit of power, or work done per unit time, equal to 1 joule per second. It is used as a measure of electrical and mechanical power. One watt is the amount of power that...

erg

(Encyclopedia)erg ûrg [key], unit of work or energy in the cgs system of units, which is based on the metric system; it is the work done or energy expended by a force of 1 dyne acting through a distance of 1 centi...

Robertson, William

(Encyclopedia)Robertson, William, 1721–93, Scottish churchman and historian. As moderator (1762–80) of the general assembly of the Church of Scotland, he led the moderate party and enforced the right of the sta...

Mayer, Julius Robert von

(Encyclopedia)Mayer, Julius Robert von, 1814–78, German physician and physicist, studied medicine at Tübingen, Munich, and Paris. From a consideration of the generation of animal heat, he was led to determine th...

Dawes, William

(Encyclopedia)Dawes, William, 1745–99, figure in the American Revolution, b. Boston, Mass. On the night of Apr. 18, 1775, Dawes rode from Boston, via Brighton Bridge, to Lexington, warning the countryside of the ...

Kelvin, William Thomson, 1st Baron

(Encyclopedia)Kelvin, William Thomson, 1st Baron, 1824–1907, British mathematician and physicist, b. Belfast. He was professor of natural philosophy at the Univ. of Glasgow (1846–99). He is known especially for...

Lind, James

(Encyclopedia)Lind, James, 1716–94, English naval surgeon. Considered the founder of naval hygiene in England, Lind observed on a ten-week cruise (1746) that 80 seamen of 350 came down with scurvy. In his Treatis...