DQ6B_solution - Discussion Question 6B P212, Week 6...

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Discussion Question 6B P212, Week 6 Kirchoff’s Law Analysis of a Resistor Network So we now have two methods for analyzing resistor networks. Which one should we use? (i) It depends on the particular problem, and (ii) often a mixture of methods is the best. In general, method 1 (successive combination of elements) is easier, but method 2 (Kirchoff’s Laws) is more powerful . .. and some circuits simply cannot be analyzed with method 1 alone. The circuit shown at right is a typical example: here we have three batteries and they prevent us from “collapsing” any of the resistors in groups, as none of them are in simple series or parallel combinations. Our only chance is to use Kirchoff’s Laws! Let all the resistors R i have resistance 10 Ω , and let the battery EMF’s be E 1 = 10 V, E 2 = 20 V, E 3 = 30 V. Your tasks are: (a) Find the current I 3 through resistor R3. (b) Find the electric potential difference, V A -V B , for the points A and B indicated on the circuit. 5 Looking at the right most branch, we see
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This note was uploaded on 06/16/2011 for the course PHYS 212 taught by Professor Kim during the Spring '08 term at University of Illinois, Urbana Champaign.

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