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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)
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
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 1˚F. 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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