SG_Chap17 - Chapter 17 Current and Resistance Name one...

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Chapter 17 Current and Resistance Name one thing that changed the world more than anything else: 17.1 Electric Current Current: I = Q/ t (Units: Coulomb/s or Ampere) like water current (liters/s) The direction of the current is the direction positive charge would flow The instantaneous current is the limit of the average current as the time interval goes to zero: 00 lim lim t av t Q II t      Two types of currents used dc: direct current (battery); current goes in one direction (worked out mostly by Edison) ac: alternating current (wall outlets); current goes back and forth (worked out mostly by Tesla, in Buffalo, of course) 17.2 Current and Drift Speed Charged particles move through a conductor of cross-sectional area A n is the number of charge carriers per unit volume n A Δx is the total number of charge carriers The total charge is the number of carriers times the charge per carrier, q – ΔQ = (n A Δx) q The drift speed, v d
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This note was uploaded on 03/30/2009 for the course PHY 102 taught by Professor Luo during the Spring '08 term at SUNY Buffalo.

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SG_Chap17 - Chapter 17 Current and Resistance Name one...

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