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20 Cards in this Set
- Front
- Back
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what are the 6 forms of energy?
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mechanical, nuclear, thermal, chemical, radiation, electrical
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list the forms of radiation, from lowest frequency (lowest energy) to highest frequency (highest energy)
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radio, microwave, ir, visible, uv, x-ray, gamma ray
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define a british thermal unit (BTU)
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a unity of energy equal to the amount of energy needed to raise the temperature of one pound of water by one degree F.
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define calorie
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amount of energy needed to raise the temp of one gram of water by one degree C.
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define food calorie
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often used when measuring energy content of food. it is equal to 1000 calories.
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define joule
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one joule = .2388 calories = .0009481 BTU
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define kilocalorie
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1000 calories
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define kilowatt-hour
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amount of energy from production/consumption of one kilowatt of power per hour.
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define therm
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100,000 BTUs
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oil, natural gas, and coal are examples of what?
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non-renewable resources
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power = ?
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energy/time
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energy = ?
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power * time
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define watt
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one watt = production/use of 1 joule/second
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define kilowatt
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1000 watts
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daily kilowatt hour consumption =
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energy consumption per day(Wh)/1000Wh
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Efficiency =
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useful energy output/total energy input
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a motor's efficiency can be measured by...
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mechanical power/electrical power
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temperature measurements are always made on which scale?
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KELVINNNNNN dougherty
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Carnot efficiency =
this will more than likely be a numerical problem on test |
Low temp= 20C+273 = 293
High temp=540C+273 = 813 (1-(293/813)) = .64 = 64% |
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overall efficiency of a powerplant =
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electrical energy output/chemical energy input
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