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Basics of Energy Part 1

by: Kime Howard

Basics of Energy Part 1 EVPP111

Marketplace > Environmental Science > EVPP111 > Basics of Energy Part 1
Kime Howard
GPA 3.96
Environmental Science 111
Dr. Kim Largen

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Environmental Science 111
Dr. Kim Largen
Class Notes
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This 2 page Class Notes was uploaded by Kime Howard on Monday September 21, 2015. The Class Notes belongs to EVPP111 at a university taught by Dr. Kim Largen in Fall 2015. Since its upload, it has received 20 views.

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Date Created: 09/21/15
Basics of Energy 0 Work force x distance 0 Energy the ability to do work 0 Kinetic Energy inof motion 0 Potential Stored energy 0 Many forms Can convert from one form to another 0 Heat Amount of energy associated with the movement of molecules in a body of matter Energy in its most random form 0 Temperature Measure of intensity of heat Re ects average speed of movement of atomsmolecules in a body of matter 0 Factors determining energy use 0 Political stability 0 Price of oil Thermodynamics 0 Study of energy transformations that occur in a collection of matter Converting food to energy to walk Energy from radioactive ore into useable energy 0 Laws of thermodynamics 1st aka Law of Conservation of Energy 0 energy can neither be created nor destroyed amount of energy in the universe is constant 2ncl Law of Thermodynamics energy conversions reduce the order of energy increasing its entropy a measure of disorder Physics of enerdv conversions and ef ciencv o What happens when energy is converted Some energy is quotlostquot to the surroundings usually in the form of heat 0 Can all of the energy in the source be converted into useful energy output No the energy lost to the surrounding could not be used O Ef ciency Useful Energy Output Total Energy Input 0 Heat Engines 0 0 Any device that converts heat into useful work Three basic components Heat source heat reservoir Heat sink cold reservoir Object on which work is done 0 For heat to ow from source to sink there must be a temperature difference The heat exhausted by a heat engine cannot be used to perform work Max efficiency is limited to the Carnot Cycle Most efficient heat energy cycle permitted by the physical laws ldeaHzed Assumes reversibility and no change in entropy ls of conceptual value because it establishes the max possible ef ciency for an engine cycle operating between two temperatures TH and Tc Uses Kelvin in calculations Carnot ef ciency Th Tc Th x 100 o Majority of the devices we use are heat engines 0 Generators and turbines 0 Produce energy but require another energy source to do so 0 Convert mechanical energy into electrical energy 0 Use electromagnetic induction Rotational energy turns coils of wire in a magnetic eld to produce an electrical current ow of electrons


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