Template2010EnergyNotes

Template2010EnergyNotes - Energy (What Is Energy?) Chapter...

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Energy (What Is Energy?) Chapter 2 Pages 42 – 47 (General Info) I . Energy A. Is the ability to do work and transfer heat. 1. Energy exists in a number of different forms that can be changed from one form to another. 2. Examples of energy a. Electrical energy-flow of electrons b. Mechanical energy- move matter c. Light or electromagnetic energy- energy produced by the sun d. heat- energy flows from a hot to colder body e. chemical energy- stored in the chemical bonds holding matter together , ie coal f. Nuclear energy= stored in nuclei of atom, fission 3. Case Study: Human Energy Use “History” a. Humans began to use energy very simple “fire” b. Used domesticated animals to help plow field. c. Burn coal and oil, split atoms to create energy. d. Wide gap in energy use per person in developed and developing countries, average American 300 times more energy consumed then a person in third world country like Ethiopian. 4. Kinetic and Potential Energy (2 major types of energy) a. Kinetic Energy – possessed by matter b/c of its mass and its speed or velocity. b. Examples of Kinetic Energy: -Ex. Energy in motion are wind, flowing stream, and electricity -Heat is another type of kinetic energy because heat from hotter object flows to colder object -Electromagnetic radiation- energy travels in the form of a wave. Different wavelength and energy content
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c. Potential Energy – is stored and potentially available for use. - Ex. = rock held in your hand, an unlit match, water behind a dam. - Potential energy can be changed to Kinetic energy, When a car engine burns gasoline, the potential energy stored in the chemical bonds of gasoline molecules changes into heat, light, and mechanical energy that propels the car. - Flashlight batteries are potential energy when off and kinetic when on. 5. Energy Quality a. Energy can be classified as having high or low quality depending on how useful it is to us as a resource. b. High quality energy is concentrated and can perform much useful work. Low quality energy is dispersed and has little ability to do work. B. Energy Laws: Two Rules We cannot break! 1. 1 st Law of Thermodynamics: We cannot create or destroy energy, although it may be converted from one form to another a. No matter how hard we try or how clever we are, we cannot get more energy out or a system than we put in, in other words, we cannot get something for nothing in terms of energy quantity. a. 2 nd Law of Thermodynamics: Whenever energy changes forms we always end up with less usable energy than we started with b. Degraded energy usually takes the form of heat given off at a low temp. to the surrounding environment
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c. Example: living environment- solar energy converted into chemical energy and then into mechanical energy during each conversion, high quality energy is degraded to low quality heat d. Example: Living Environment – solar energy converted into chemical energy and then into mechanical energy, during each conversion, high quality energy is degraded to low quality heat. 2.
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This note was uploaded on 03/02/2011 for the course SCI 101 taught by Professor Draper during the Spring '11 term at Goddard.

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Template2010EnergyNotes - Energy (What Is Energy?) Chapter...

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