Lecture 8 021110 - Chapter 27 Circuits February 11, 2010 E...

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Unformatted text preview: Chapter 27 Circuits February 11, 2010 E +- i V E Unlike the electrostatic case, the electric field in the conductor of the figure is not zero. We define as resistivity of the conductor the ratio In vector form: E J J E Resi SI u stivit nit r y fo 2 The conductivity is defined as: Using the previou V/m V m m A/m s equation takes the for 1 m A : J E : Consider the conductor shown in the figure above. The electric field inside the conductor . The current density We substitute and into / equation and get: / V i E J E J L A E V L V A A R J i A i L L L R A L R A E J J E (26 -7) New Concepts:- Kirchhoffs loop rule- Kirchhoffs junction rule- Multiloop circuits- Resistors in series- Resistors in parallel- RC circuits, charging and discharging of a capacitor (27 1) R i motion- V iR R i motion V iR motion- V +- motion V +- For a move through a resistance in the direction of the current, the change in the potential For a move through a resistance in the direction opposite to that of the current, th V iR Resistance Rule: e change in the potential V iR For a move through an ideal emf device in the direction of the emf arrow, the change in the potential For a move through an ideal emf device in a direction opposi te to that of the V EMF Rule: emf arrow, the change in the potenti al V (27 6) iR (27 5) Current in a single loop circuit: the overall voltage drop across a closed loop is zero. Consider the circuit shown in the figure. We wish to calculate the potential difference between point b and point a....
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This note was uploaded on 03/26/2010 for the course PHYS 021 taught by Professor Hickman during the Spring '08 term at Lehigh University .

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Lecture 8 021110 - Chapter 27 Circuits February 11, 2010 E...

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