Lecture 6 PES Su 2011 annotated

Lecture 6 PES Su 2011 annotated - ME 200: Thermodynamics I...

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Unformatted text preview: ME 200: Thermodynamics I Lecture 6: Internal Energy, U, Total Energy, E, and Heat Transfer, Q Prof. Sojka Summer 2011 2 In this Lecture Internal Energy, U Total Energy, E Heat Transfer, Q 3 Internal Energy Internal Energy (or thermal energy) is some measure of the energy content of a substance. Its an extensive property. It depends on molecular processes. Its magnitude is somewhat proportional to temperature. Symbol: U or u 4 Internal Energy Why do we define U ? Because many processes transfer energy to a system without increasing either its KE or PE . Examples: Heating water via sunlight Temperature rise in a resistor when a current flows through it 5 Total Energy of a System Total Energy ( E ) = KE + PE + U Kinetic Energy + Potential Energy + Internal Energy Change in Total Energy, E U PE KE E associated with the motion of the system associated with the position of the system associated with the energy content of the system 29 1 2 1 2 1 2 1 2 U U PE PE KE KE E E- +- +- =- 6...
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This note was uploaded on 09/26/2011 for the course ME 200 taught by Professor Gal during the Summer '08 term at Purdue University-West Lafayette.

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Lecture 6 PES Su 2011 annotated - ME 200: Thermodynamics I...

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