12 - Current and Resistance

12 - Current and Resistance - PHYSICS 212 Fall 2009 Current...

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PHYSICS 212 Fall 2009 Current and Resistance 9/21/2009
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Moving Charges Switch from electrostatics to charges in motion Moving Charges Cause Currents household wiring lightening solar wind beam of electrons “nerve-currents” in our body Different Types of Materials conductors - metallic and ionic semiconductors superconductors plasmas Focus on steady currents in conductors
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Current Amount of charge that Fows past a point (per unit time) Units: 1(A)mpere = 1(C)oulomb/(s)econd [A=C/s] Direction of Current ±low Although charge carriers are negatively charged electrons, the direction of the current is in the direction that positive charge carriers would Fow. scalar quantity i = Δ q Δ t
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Moving Charges Which one of the following statements concerning the electric Feld inside a conductor is true if electrons are moving from right to left in a conducting wire? a) The electric Feld must be zero in this case. b) The electric Feld is directed perpendicular to the direction the electrons are moving. c) The electric Feld is directed toward the left. d) The electric Feld is directed toward the right.
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Current Flow Kirchoff’s Rule - Junctions - current splits at a junction but is conserved.
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This note was uploaded on 10/03/2011 for the course PHYS 212 taught by Professor Tedeschi during the Fall '08 term at South Carolina.

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12 - Current and Resistance - PHYSICS 212 Fall 2009 Current...

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