Residential Electric Power Bill $145.6/1948 kWh = $0.0747/kWh Avg. Power: 1948kWh/31day.24h/day = 2.6 kW.

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Presentation transcript:

Residential Electric Power Bill $145.6/1948 kWh = $0.0747/kWh Avg. Power: 1948kWh/31day.24h/day = 2.6 kW.

Commercial Power Costs Energy cost estimates for a project out at IUCF: use (i.e. energy) charge: $3105/(360hr*575kW)=$0.0147/kWh peak use (i.e. maximum power demand) charge: $13.11/kW Why is this different from the residential calculation?

Energy Conversions (Table 2.2) Automatically Happens! digestion thermal A key question to consider is with what EFFICIENCY can each of these Conversions be accomplished (Useful energy output/ total energy input)

Efficiencies of typical Devices DeviceTransfer effectedEfficiency GeneratorsKinetic-Electrical70-99% Elec. MotorsElect.-Kinetic50-90% TransformerElectrical-Electrical95-99% Gas FurnaceChem.-Thermal70-95% Wind TurbineKinetic-Electrical35-50% Power PlantNucl/Chem-Elect.30-40% Fuel CellChem-Electrical50-60% Solar CellRadiant-Electrical5-28% Fluoresc. LightElectrical-Radiant20% Incandescent lightElectrical-Radiant5%

Energy Losses in a Car NOTE: only 13% gets to the wheels and ALL of that goes to thermal energy (eventually) See also:

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Efficiencies of typical Devices DeviceTransfer effectedEfficiency GeneratorsKinetic-Electrical70-99% Elec. MotorsElect.-Kinetic50-90% TransformerElectrical-Electrical95-99% Gas FurnaceChem.-Thermal70-95% Wind TurbineKinetic-Electrical35-50% Power PlantNucl/Chem-Elect.30-40% Fuel CellChem-Electrical50-60% Solar CellRadiant-Electrical5-28% Fluoresc. LightElectrical-Radiant20% Incandescent lightElectrical-Radiant5%

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What is Temperature? It is the quantity that determines the direction of heat flow (from higher Temperature to lower temperature) when two objects are brought into thermal contact. (“zeroth law of thermodynamics”) For gases under normal circumstances this is related to the average energy per molecule, BUT this relationship is not valid in all circumstances nor for all materials.

Specific Heats Ice (near 0 o C) 2090 J/kg.K=2090 J/kg.C o Water (near 0 o C) 4186 J/kg.K=1000 cal/kg.C o Aluminum 900 J/kg.K Copper 387 J/kg.K This is how thermal energy and temperature are related!! Temperature Scales: 0 o C = K ice melts at this temp 100 o C = K water boils at this temp 0 K: absolute zero, the coldest temperature possible. Note that 1C o = 1 K. The Celsius degree and the Kelvin are the same size! The only difference in the scales is the position of the origin, hence the two scales are equivalent for talking about temperature DIFFERENCES, but not for talking about absolute temperatures.

Phase transitions in water

Possible Swain journals for Article Summary. Scientific American (e.g. Sept. 2006) Nature (e.g. Nov. 2001) Science (access through Swain library web page, they no longer have paper copies) Science News Physics Today The Physics Teacher Bulletin of the Atomic Scientists