Lecture_4 - 1 BME 311 Network Theory John X.J. Zhang, UT...

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Unformatted text preview: 1 BME 311 Network Theory John X.J. Zhang, UT Austin 1 Basic Circuit Analysis Ohm's law Concepts of nodes, branches, and loops Kirchhoff's current and voltage laws Combining resistors in series and in parallel Principles of voltage division and current division Wye-delta transformation BME 311 Network Theory John X.J. Zhang, UT Austin 2 Resistance R R : the physical property of resisting the flow of electric charge R is measured in ohms ( ) A l R = : resistivity, unit: ohm-meter ( m) Fixed resistor Variable resistor 2 BME 311 Network Theory John X.J. Zhang, UT Austin 3 Ohms Law Voltage v across a resistor is directly proportional to the current i flowing through the resistor Not all resistors obey Ohms Law A linear resistor obey Ohms Law A nonlinear resistor does not obey Ohms Law Passive Sign Convention ) 1 1 ( A V i v R or iR v = = = l, A, T BME 311 Network Theory John X.J. Zhang, UT Austin 4 Ohms Law Mental Image 3...
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This note was uploaded on 03/19/2008 for the course BME 311 taught by Professor Zhang during the Spring '08 term at University of Texas at Austin.

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Lecture_4 - 1 BME 311 Network Theory John X.J. Zhang, UT...

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