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kilowatt
(Encyclopedia) kilowatt: see watt.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…British thermal unit
(Encyclopedia) British thermal unit, abbr. Btu, unit for measuring heat quantity in the customary system of English units of measurement, equal to the amount of heat required to raise the temperature…multiplication
(Encyclopedia) multiplication, fundamental operation in arithmetic and algebra. Multiplication by a whole number can be interpreted as successive addition. For example, a number N multiplied by 3 is…heat capacity
(Encyclopedia) heat capacity or thermal capacity, ratio of the change in heat energy of a unit mass of a substance to the change in temperature of the substance; like its melting point or boiling…windmill
(Encyclopedia) windmill, apparatus that harnesses wind power for a variety of uses, e.g., pumping water, grinding corn, driving small sawmills, and driving electrical generators. Windmills were…calorie
(Encyclopedia) calorie, abbr. cal, unit of heat energy in the metric system. The measurement of heat is called calorimetry. The calorie, or gram calorie, is the quantity of heat required to raise the…Common Formulas
CIRCUMFERENCE Circle: C = πd, in which π is 3.1416 and d the diameter.AREA Triangle: A = (ab)/2 , in which a is the base and b the height. Square: A = a2, in which a is one of the sides.…Conversion Factors
Below are instructions for converting factors, including changing acres to hectares, Btu/hour to horsepower, centimeters to inches, degrees to radians, feet to miles, furlongs to feet, liters to…World Net Electricity Consumption by Selected Regions, 1990–2025
(billion kilowatt-hours) Region Projections 2001 2010 2015 2020 2025 Average annual percent change, 2001–2025 United States 3,386 4,055 4,429 4,811 5,207 1.8% Japan 788 870 920 965 1,012 1.0…Trending
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