p240_ct10_w12_feb_7 - Physics 240 Winter 2012 Lecture#10 My...

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Physics 240 Winter 2012 Lecture #10 Dr. Dave Winn 2405 Randall [email protected] My Office Hours (1416 Randall Lab) Monday 1pm-3pm Tuesday 1pm-3pm Thursday 2pm-4pm (Prof. Gidley) Learning Assistant Office Hours Tuesday 4-8pm Thursday 4-6pm Also in chat room Tue/Thu evening!
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Two copper wires of different diameter are joined end-to-end, and a current flows in the wire combination. When electrons move from the larger-diameter wire into the smaller-diameter wire, Q25.1 A. their drift speed increases. B. their drift speed decreases. C. their drift speed stays the same. D. not enough information given to decide
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Electrons in an electric circuit pass through a resistor. The wire has the same diameter on each side of the resistor. Compared to the potential energy of an electron before entering the resistor, the potential energy of an electron after leaving the resistor is A. greater. B. less. C. the same. D. not enough information given to decide Q25.3
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