lec06_ddn2x2 - Lecture 6 Electrostatics versus Electric...

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9/11/11 1 Lecture 6 • Current • Resistivity as a property of materials • Emf 9/11/11 2 Electrostatics versus Electric Current 9/11/11 3 Electric Current Notice that flow of positive charge in one direction, + + + + + + + + + + CURRENT I Becomes more positive Becomes more negative • It’s completely equivalent to negative charge in the opposite direction. CURRENT I Becomes more positive Becomes more negative - - - - - - - - - - 9/11/11 4 Drift Velocity with without
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9/11/11 5 Drift Speed, Total Charge & Current n = # charge carriers volume q = charge of each particle v d = drift velocity 9/11/11 6 Relationship between Current and Drift Speed Find v d for 14-gauge copper wire carrying a current of 1 A. Assume there is 1 free electron/atom. n = n atoms = ! N M Copper ! = 8.93 g/cm 3 M = 63.55 g/mol 14 gauge wire Area = 2.081 mm 2 v d = I qnA 9/11/11 7 Electric Current one q in one q out 9/11/11 8 Resistance Resistance is a property of the object, i.e . It depends on the shape and material
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This note was uploaded on 12/07/2011 for the course PHYS 221 taught by Professor Pyrak-nolte,laura during the Fall '08 term at Purdue University.

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lec06_ddn2x2 - Lecture 6 Electrostatics versus Electric...

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