Phys 0175 - Lecture 17

Phys 0175 - Lecture 17 - Lecture 17 (Feb. 20 2009): Chapter...

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Lecture 17 (Feb. 20 2009): Chapter 27: Circuits Essential elements of an electrical circuit Definition of emf; internal resistance Single loop circuits; resistors in series Multiloop circuits; resistors in parallel Analyzing multiloop circuits using Conservation of Energy and Conservation of Charge Illustrative examples
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Electromotive Force: A steady electric current requires a complete circuit. Otherwise the moving charges will quickly set up an electric field that opposes the electric field that existed initially and the current would stop. In order to produce a steady flow of charge a circuit needs to have a “charge pump” that maintains a potential difference between a pair of terminals, i.e. a battery or a power supply. Such a device is called a source of electromotive force (emf)
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Schematic diagram of an ideal source of emf connected to a complete single loop circuit E = iR Always remember that charge is conserved in a circuit The connecting wire segments are assumed to have zero resistance
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This note was uploaded on 04/06/2009 for the course PHYS 0175 taught by Professor Koehler during the Spring '08 term at Pittsburgh.

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Phys 0175 - Lecture 17 - Lecture 17 (Feb. 20 2009): Chapter...

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