Phys 0175 - Lecture 15

# Phys 0175 - Lecture 15 - Reminder Homework Assignments PHYS...

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Reminder: Homework Assignments: PHYS 0175 – LON-CAPA HW #05 Now Open: Due on Sunday(@11pm), February 22th

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Lecture 15 (Feb. 16, 2009): Chapter 26: Current and Resistance Definition of electric current Current density Drift speed Resistance and resistivity Calculating the resistance of a conductor Ohm’s Law
Electric Current: We now move from Electrostatics (the study of charges at rest) to the study of charges in motion (electric current) . Electric current conveys energy from one place to another Definition of electric current: dq i dt = SI unit: 1 C/s = 1 A (ampere)

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Conservation of charge implies that the current i through this conductor has the same value at the three cross-sectional planes a-a’, b-b’, and c-c’.
that the current flowing into any junction must equal the current flowing out of that junction. What are the magnitude and direction of i? 4A+3A+2A-1A-2A+2A+i=0

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Phys 0175 - Lecture 15 - Reminder Homework Assignments PHYS...

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