19_InstSolManual_PDF_Part4

19_InstSolManual_PDF_Part4 - r L new 5 V p d 2 4 r 1 2 L 2...

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19.19. Set Up: Ohm’s law says is a constant. Solve: (a) The graph is given in Figure 19.19a. (b) No. The graph of versus I is not a straight line so does not obey Ohm’s law. (c) The graph of R versus I is given in Figure 19.19b. R is not constant; it decreases as I increases. Figure 19.19 Reflect: Not all materials obey Ohm’s law. 19.20. Set Up: Since the battery has negligible internal resistance, Solve: (a) (b) (c) 19.21. Set Up: where I is the current through the battery and V is the potential difference applied to the person. Solve: This is well within the range of common household voltages. 19.22. Set Up: Current is measured in A, potential difference in V. Problem 19.21 says the resistance of a wet human is 1 k . Solve: (a) Volts are not current; he probably meant a potential difference of 12 V. (b) Problem 19.21 says currents above 10 mA are dangerous, so this current is dangerous. 19.23. Set Up: and Solve: 19.24. Set Up: Table 19.1 gives for gold. Solve: (a) (b) 19.25. Set Up: so Solve: (a) (b) I new 5 V p d new 2 4 r L 5 V p 1 2 d 2 2 4 r L 5 4 I d new 5 2 d . I new 5 V p d 2 4
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Unformatted text preview: r L new 5 V p d 2 4 r 1 2 L 2 5 1 2 I L new 5 2 L . I 5 V R 5 VA r L 5 V p 1 d / 2 2 2 r L 5 V p d 2 4 r L . V 5 IR R 5 r L A . V 5 IR 5 1 1.15 A 21 0.282 V 2 5 0.324 V R 5 4 r L p d 2 5 4 1 2.44 3 10 2 8 V # m 21 6.40 m 2 p 1 0.840 3 10 2 3 m 2 2 5 0.282 V r 5 2.44 3 10 2 8 V # m V 5 IR . R 5 r L A 5 r L p 1 d / 2 2 2 . 1 V 5 1 V / A 5 1 kg # m 2 / A 2 # s 3 1 V 5 1 N # m / C 5 1 1 kg # m / s 2 2 # m / C 5 1 1 kg # m 2 / s 2 2 / A # s 5 1 kg # m 2 / A # s 3 1 N 5 1 kg # m / s 2 1 V 5 1 N # m / C. 1 V 5 1 V / A I 5 V R 5 6 V 1 k V 5 16 mA. V 5 IR . V V 5 IR 5 1 5.0 3 10 2 3 A 21 1000 V 2 5 5.0 V. V 5 IR , E 5 IR 5 1 0.453 A 21 83.3 V 2 5 37.7 V I 5 E R 5 12.0 V 83.3 V 5 0.144 A R 5 E I 5 1.50 V 18.0 3 10 2 3 A 5 83.3 V E 5 IR . 4.80 4.40 4.00 3.60 3.20 2.80 2.40 0.00 1.00 2.00 3.00 4.00 V ab 1 V 2 ( a ) I 1 A 2 I 1 A 2 R 1 Ohms 2 ( b ) 6.00 5.00 4.00 3.00 2.00 1.00 0.00 1.00 2.00 3.00 4.00 Thyrite TM V ab R 5 V ab I 19-4 Chapter 19...
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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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