Energy Consumption and Estimates

Energy Consumption and Estimates - Energy, Society, and the...

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Energy, Society, and the Environment Unit I: Units, Energy Types, Energy Consumption, Back-of-the-Envelope Estimates
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Unit I Phys 202 Spring 2009 We use A LOT of energy
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Unit I Phys 202 Spring 2009 It is a measure of wealth
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Unit I Phys 202 Spring 2009 It is a measure of wealth
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Unit I Phys 202 Spring 2009 And a measure of attitude
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Unit I Phys 202 Spring 2009 Total Consumption and Sources
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Unit I Phys 202 Spring 2009 Units of Energy 5 figures from 5 different sources; 4 different units!!! ENERGY Joule: the energy unit in the meter-kilogram-second system Calorie: amount of energy needed to heat 1 g of water by 1 degree Celsius (1.8 degrees Fahrenheit) BTU (British Thermal Unit) -- ACs, furnaces, stoves typically labeled with Btus Electron-Volt -- important for batteries etc. Other Frequently Used Energy Units: Barrels of oil equivalent (bboe), kWh
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Unit I Phys 202 Spring 2009 Power Power = Energy / time Watt = W = Joule/s = J/s You can use energy at a slow rate or a fast rate Any unit of power x any unit of time = energy One such “mixed” unit: kWh
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Phys 202 Spring 2009 Example Which uses more energy? A 40 W bulb on for two hours or a 60 W bulb on for an hour? How many kWh is each usage? 60
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Energy Consumption and Estimates - Energy, Society, and the...

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