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Unformatted text preview: Physics 240 Winter 2012 Lecture #12 Dr. Dave Winn 2405 Randall Lab [email protected] My Office Hours (1416 Randall Lab) Monday 1pm3pm Tuesday 1pm3pm Thursday 2pm4pm (Prof. Gidley) Learning Assistant Office Hours Tuesday 48pm Thursday 46pm Also in chat room Tue/Thu evening! Which of the two arrangements shown has the smaller equivalent resistance between points a and b ? Q26.1 A. the series arrangement B. the parallel arrangement C. The equivalent resistance is the same for both arrangements. D. The answer depends on the values of the individual resistances R 1 , R 2 , and R 3. Three identical light bulbs are connected to a source of emf as shown. Which bulb is brightest? Q26.7 A. light bulb A B. light bulb B C. light bulb C D. both light bulbs B and C (Both are equally bright and are brighter than light bulb A. ) E. All bulbs are equally bright. Comparing resistors and capacitors in parallel and in series If R 1 = R 2 = R then R eq = R/2 If R 1 >> R 2 then R eq R 2 If C 1 = C 2 = C then C eq = C/2 If C 1 >> C 2 then C eq C 2 If R 1 = R 2 = R then R eq = 2R If R 1 >> R 2 then R eq R 1 If C 1 = C 2 = C then R eq = 2C If C 1 >> C 2 then C eq C 1 Decreases Decreases Increases Increases The circuit in front of you contains a single lightbulb, bulb A, that burns with a certain brightness. We will now add an identical bulb, bulb B, in series with bulb A. What will happen?...
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This note was uploaded on 02/15/2012 for the course PHYS 240 taught by Professor Winn during the Winter '11 term at University of Michigan.
 Winter '11
 Winn
 Physics

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