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Chapter 27: Current and Resistance

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Physics for Scientists and Engineers: A Strategic Approach with Modern Physics
Pages: 742 - 765

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83 Questions for Chapter 27: Current and Resistance

  1. Suppose a time machine has just brought you forward from 1750(post-Newton but pre-electricity) and you've been shown the lightbulb demonstration of FIGURE Q27.1. Do observations or simple measurements you might make-measurements that must make sense to you with your 1700'sknowledge-prove that something is flowing through the wires? Or might you advance an alternative hypothesis for why the bulb is glowing? If your answer to the first question is yes, state what observations and/or measurements are relevant and the reasoning from which you can infer that something must be flowing. If not, can you offer an alternative hypothesis about why the bulb glows that could be tested?

    Found on Page 761
  2. 1.0×1020electrons flow through a cross-section of a 2.0mmdiameter iron wire in 5.0s. What is the electron drift speed?

    Found on Page 762
  3. The current in a 100wattlightbulb is 0.85A. The filament inside the bulb is 0.25mmin dia

    Found on Page 762
  4. In an integrated circuit, the current density in a 2.5m-thick×75μm-widewide gold film is localid="1648893767234" 7.5×105A/m2. How much charge flows through the film in 15min?

    Found on Page 762
  5. Which, if any, of these statements are true? (More than one may be true.) Explain. Assume the batteries are ideal.

    Found on Page 761
  6. The current in an electric hair dryer is 10.0A. How many electrons flow through the hair dryer in 5.0min?

    Found on Page 762
  7. When a nerve cell fires, the charge is transferred across the cell membrane to change the cell's potential from negative to positive. For a typical nerve cell, 9.0pCof charge flows in a time of 0.50ms. What is the average current through the cell membran

    Found on Page 762
  8. The current in a2.0mm×2.0mmsquare aluminum wire is 2.5A. What are (a) the current density and (b) the electron drift sp

    Found on Page 762
  9. 15. A hollow copper wire with an inner diameter of 1.0mmand an outer diameter of 2.0mm carries a current of 10A. What is the current density in the w

    Found on Page 762
  10. 16. A car battery is rated at 90Ah, meaning that it can supply a 90A current for 1h before being completely discharged. If you leave your headlights on until the battery is completely dead, how much charge leaves the battery?

    Found on Page 762

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