Lecture 4 Lecture Notes

# Lecture 4 Lecture Notes - b Kirchhoff's law(for stationary...

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2. Electric Circuits 2.1 Ohm's law 2.2. Quasistatic approximation collisions between charged particles and other matter => friction => equilibrium conductivity Typically: frequent collisions => low velocity Ohm's law have current follow E-field via Ohm's law neglect consistency quasi-static currents Interpretation: - Internal B-field (generated by circuit) follows current density J instantaneous - Instantaneous coupling E <=> J (Ohm) and B <=>J (Quasistatic approximation to Maxwell Equation) Lec 04 - 12. Jan Monday, January 12, 2009 8:35 AM Lecture Notes Page 1

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2.3 Properties of electric circuits a) charges (for stationary or quasi-static currents) no charges in a homogeneous conductor with stationary currents
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Unformatted text preview: b) Kirchhoff's law (for stationary or quasi-static currents) current passing through surface c) Joule's heating law power-density velocity force density charge density for moving particles (dissipated energy per time & volume) d) Restistance cross section area Kirchhoff's law: (independent of x) Ohm for any path C R: resistance along path C Lecture Notes Page 2 confined to source! inner resistance voltage of source electrostatic Field force per unit charge e) Electromotive Force Along full circuit: Any vector field F can be decomposed into transversal and longitudinal part: Here: Source outer circuit Note: 'Source' is in a way defined as the region where f= 0 Lecture Notes Page 3...
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Lecture 4 Lecture Notes - b Kirchhoff's law(for stationary...

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