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16 Cards in this Set
- Front
- Back
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work
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the product of a force times a distance
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kinetic energy
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energy of motion
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first law of thermodynamics
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the principle that energy cannot be created or destroyed but is always conserved
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potential energy
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stored energy
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heat energy
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energy from random motion of atoms and molecules
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second law of thermodynamics
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energy always tends to go from a more usable (higher-quality) form to a less usable form (lower-quality) for- when you use energy, you lower its quality
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quality(of energy)
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the availability of energy to perform work. the higher the quality of energy the more easily it can be converted to work, the lower the more difficult it is to convert to work
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first law efficiency
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the amount of energy without any consideration of the quality or availability of the energy (often misleading)
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second law efficiency
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how well matched the energy end use is with the quality of the energy source
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heat engines
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nuclear fuel, coal, gas or other fuels
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thermal efficiency
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the maximum possible efficiency of a heat engine
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electrical resistivity
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a natural resistance to electrical flow. This resistance converts some of the electric energy to heat energy which is radiated into the environment
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cogeneration
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the capture and use of waste heat
Ex:natural gas combined cycle power plant- gas turbine/steam cycle -increases efficiency from 33-75% reducing losses form 67 to 25% |
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integrated energy management
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recognizes that no single energy source can provide all the energy required by the various countries of the world
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sustainable energy development
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-provide reliable sources of energy
-would not destroy or seriously harm our global, regional, or local environments -would help ensure that future generations inherit a quality environment with a fair share of the earth's resources |
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power
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rate of energy use/energy divided by time
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