Week 2 of EVR2001 Notes
Week 2 of EVR2001 Notes EVR2001
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This 2 page Class Notes was uploaded by Carly Minsky on Thursday February 25, 2016. The Class Notes belongs to EVR2001 at University of Florida taught by Dr. Coenan in Spring 2016. Since its upload, it has received 62 views. For similar materials see Intro to Environmental Science in Environmental Science at University of Florida.
Reviews for Week 2 of EVR2001 Notes
Better than the professor's notes. I could actually understand what the heck was going on. Will be back for help in this class.
-Ms. Dax Senger
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Date Created: 02/25/16
EVR 2/11/16 ENERGY Fundamentals of energy o Energy is the ability to do work Radiant-energy contained in electromagnetic radiation, e.g. solar radiation Chemical-energy stored in molecular bonds. Photosynthesis convert radiant energy into chemical energy Kinetic-energy of motion. Wind, for example, is solar energy converted into moving air Potential-energy of position. Can be converted into kinetic energy by allowing the object/substance to roll/flow to a lower elevation Mechanical-the sum of kinetic and potential energy o Energy quality-how easy it is to capture and use various types of energy sources. Relates to energy density (amount of energy per unit volume). Energy vs. Power o Energy is the ability to do work (an amount). Power is the rate at which energy is consumed or produced o Energy is abbreviated as W or E, whereas power is P o SI Unite for energy is Joule (J) whereas power is Watt (W)=1 Joule/second o Other common units for energy: calorie (4.2 J), kcal (4.2 kJ-dietary calorie), BTU (1055 J), kWh (3.6 MJ). Other common units for power: horsepower (735.5 W) Laws of Thermodynamics o First Law: Energy (and therefore mass) can neither be created nor destroyed, just converted from one form to another. The amount of energy doesn’t change during conversions o Second Law: With each conversion, energy loses some ability to do work. In other words, its quality and/or density degrades o Entropy A measure of the lost ability of energy to do work …or a measure of the decrease in order of a system The entropy of the universe increases with each energy transformation Entropy of small systems may decrease at the expense of increasing the entropy of the universe 2
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