EnergyConcepts

EnergyConcepts - (replaced by the joule in most countries)....

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Mechanical – move or lift matter (potential and kinetic Thermal – Heat energy Chemical – stored in chemical bonds Electrical – from motion of electrons Nuclear – stored in nucleus of atoms Electromagnetic – light (travels by waves)
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First Law Energy cannot be created or destroyed Second Law When energy is converted from one form to another – some is changed into low-quality energy (heat).
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Watt (electrical) – 1 kilowatt-hour is the amount of energy expended by a 1 kilowatt (1000 watts) device over the course of 1 hour. Watt (thermal) – Nuclear power plants produce heat measured in thermal watts
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BTU – British Thermal Unit. Used in the US
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Unformatted text preview: (replaced by the joule in most countries). The amount of heat required to raise the temp. of 1 pound of water by 1F. 1 watt is about 3.4 Btu/hr. 1 HP is about 2450 Btu/hr. 12,000 Btu/hr is referred to as a ton in air-conditioning applications Horsepower (HP) used mainly in automobile industry. 1 HP is = to 746 watts. Knowing how to convert units is extremely important for success on the APES exam. Use dimensional analysis (factor-label method) to show your work as to how you converted from one unit to another. Always show your work even for simple steps You must be comfortable with both scientific notation as well as...
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EnergyConcepts - (replaced by the joule in most countries)....

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