19_InstSolManual_PDF_Part3

19_InstSolManual_PDF_Part3 - 5 3.88 V . Nichrome TM V ab...

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19.13. Set Up: The volume of the wire remains the same when it is stretched. Solve: so Reflect: When the length increases the resistance increases and when the area decreases the resistance increases. 19.14. Set Up: and Solve: 19.15. Set Up: Solve: Reflect: is positive and the resistance increases when the temperature increases. 19.16. Set Up: Solve: 19.17. Set Up: Ohm’s law says where R is a constant. Solve: (a) Ohm’s law says a graph of V versus I is a straight line. That is the case here, so this object obeys Ohm’slaw . (b) says R is the slope of a graph of V versus I. (c) Reflect: We can always define but only when R is independent of I does the object obey Ohm’s law. 19.18. Set Up: Ohm’s law says is a constant. Solve: (a) The graph is given in Figure 19.18. Figure 19.18 (b) The graph of versus I is a straight line so obeys Ohm’s law. (c) R is the slope of the graph in part (a). R 5 15.52 V 2 1.94 V 4.00 A 2
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This note was uploaded on 03/06/2009 for the course PHYS 114 taught by Professor Shoberg during the Spring '07 term at Pittsburg State Uiversity.

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