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19_InstSolManual_PDF_Part3

19_InstSolManual_PDF_Part3 - 5 3.88 V Nichrome TM V ab 16.0...

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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’s law. (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 0.50 A 5 3.88
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Unformatted text preview: 5 3.88 V . Nichrome TM V ab 16.0 12.0 8.0 4.0 0.0 0.00 1.00 2.00 3.00 4.00 I 1 A 2 V ab 1 V 2 R 5 V ab I R 5 V / I , R 5 0.60 V 2 0.30 V 4.0 3 10 2 3 A 2 2.0 3 10 2 3 A 5 150 V V 5 IR V 5 IR , T 5 13.8 C° 1 4.0°C 5 17.8°C. T 2 T 5 1 R T / R 2 2 1 a 5 1 215.8 V / 217.3 V 2 2 1 2 0.00050 1 C° 2 2 1 5 13.8 C°. R T 5 R 3 1 1 a 1 T 2 T 24 a a 5 R T 2 R R 1 T 2 T 2 5 1.512 V 2 1.484 V 1 1.484 V 21 34.0°C 2 20.0°C 2 5 1.35 3 10 2 3 1 C° 2 2 1 R T 5 R 3 1 1 a 1 T 2 T 24 R T 5 1 100.00 V 23 1 1 1 0.00040 1 C° 2 2 1 21 0.0°C 2 11.5°C 24 5 99.54 V R 5 100.00 V . T 5 11.5°C T 5 0.0°C. R T 5 R 3 1 1 a 1 T 2 T 24 . R new 5 r L new A new 5 r 1 3 L 2 A / 3 5 9 r L A 5 9 R . A new 5 L L new A 5 A 3 . LA 5 L new A new . Volume 5 LA L new 5 3 L . R 5 r L A . Current, Resistance, and Direct-Current Circuits 19-3...
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