sol-e1-sm09 - D. 8 107 m E. 107 m The resistance R = V/I =...

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Phy 2049 Exam I Solutions For answers to problems 1-12, go to solutions for exam I summer 2007. 13. A nichrome wire is 1m long and 1 × 10 −6 m 2 in cross-sectional area. When connected to a potential difference of 2V, a current of 4A exists in the wire. The resistivity of this nichrome is: A. 5 × 10−7 Ω · m B. 2 × 10−7 Ω · m C. 4 × 10−7 Ω · m
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Unformatted text preview: D. 8 107 m E. 107 m The resistance R = V/I = 0.5 . The relation R = l/A relates the resistivity to = RA/l = 5x10--7 m. 14. A flat iron is marked 120V, 600W. In normal use, the current in it is: A. 5A B. 4A C. 2A D. 7.2A E. 0.2A Power P = VI. It follows that I = P/V = 5A ....
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This note was uploaded on 12/05/2011 for the course PHY 2049 taught by Professor Any during the Spring '08 term at University of Florida.

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