Entertainment / Photography / Joule: Unit used to quantify the light output of electronic flash. A joule is equal to one watt second of 40 lumen-seconds. The measure is used to compare flash units in terms of power output.
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Health / Vitamins / Kilojoule (Kj): A measurement of the energy in food. 1 calorie is equal to 4.2 kilojoules. MORE
Technology / Home Audio / Sound Power: The total amount of acoustical energy produced by a sound source and measured in Joules per second. The degree to which this measurement is constant( or linear)with respect to frequency, is an index o MORE