lecture14 - Electrical Work and Power Electrical Electrical...

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Electrical Work and Power Electrical Work and Power
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Electrical Work and Power Electrical Work and Power I I + - Higher V Lower V 2 Resistance R Current I flows through a potential difference   Follow a charge Q : at positive end,    U 1  = QV 1            at negative end,   U 2  = QV 2 P.E.   Decreases:   0 U Q V = < The speed of the charges is constant in the wires and resistor.  What is electrical potential energy converted to?
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Electrical resistance converts electrical potential energy to thermal  energy (heat), just as friction in mechanical systems converts  mechanical energy to heat.  This thermal energy means the atoms in the conductor move faster and so the conductor gets hotter. The average kinetic energy of the electrons doesn’t increase once  the current reaches a steady state; the electrons lose energy in  collisions with the atoms as fast as it is supplied by the field. 
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This note was uploaded on 10/14/2011 for the course ENGINEER CHEM ENG 3 taught by Professor Ghosh during the Spring '11 term at McMaster University.

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lecture14 - Electrical Work and Power Electrical Electrical...

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