11 currentResistance

11 currentResistance - Craig Ogilvie Review lecture 10...

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Unformatted text preview: Craig Ogilvie Review lecture 10 Potential energy stored in a capacitor Energy density u, Since energy-density only depends on E, consistent with potential energy stored in E-field Polar molecules in dielectric produce E-field opposite to Craig Ogilvie 11 QV CV U 2 1 2 1 2 = = 2 2 1 E u = vacuum tric withdielec KC C = Craig Ogilvie Goals Craig Ogilvie 22 Movement of mobile charges through a conductor Current Today Core ideas applicable to Metals, electrical engineering Ionic solvents, chemistry, biology Semi-conductors, computer engineering Next week Circuits Craig Ogilvie Demo: Analog of drift velocity Ping-pong ball Gravitational force accelerates ball down ramp It collides with nails, stops, accelerates again Drift velocity is the average velocity Averaged over many ping-pong balls, many collisions etc. In a circuit, E-field established within conductor Electrons accelerate, collide, accelerate Average drift velocity Craig Ogilvie 33 Craig Ogilvie Question: Conduction in a metal, 1st round Craig Ogilvie 44 Which of the following factors will, if increased , reduce the amount of current i) Mass of moving charge particle ii)...
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This note was uploaded on 09/20/2011 for the course PHYS 222 taught by Professor Johnson during the Spring '07 term at Iowa State.

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11 currentResistance - Craig Ogilvie Review lecture 10...

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