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Chapter 19: Circuits Elements

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Matter & Interactions
Pages: 765 - 804
Matter & Interactions

Matter & Interactions

Book edition 4th edition
Author(s) Ruth W. Chabay, Bruce A. Sherwood
Pages 1135 pages
ISBN 9781118875865

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Illustration

65 Questions for Chapter 19: Circuits Elements

  1. The two circuits shown in Figure 19.59 have different capacitors but the same batteries and thin-filament bulbs. The capacitors in circuit 1and circuit 2areidentical exceptthat the capacitor in circuit 2was constructed with its plates closer together. Both capacitors have air between their plates. The capacitors are initially uncharged. In each circuit the batteries are connected for a short time compared to the time required to reach equilibrium, and then they are disconnected. In which circuit (1or 2) does the capacitor now have more charge? Explain your reasoning in detail.

    Found on Page 765

  2. The circuit shown in Figure 19.61 consists of two flashlight batteries, a large air-gap capacitor, and Nichrome wire. The circuit is allowed to run long enough that the capacitor is fully charged with +Qand-Q on the plates.

    Found on Page 795

  3. Found on Page 765

  4. A capacitor with a slab of glass between the plates is connected to a battery by Nichrome wires and allowed to charge completely. Then the slab of glass is removed. Describe and explain what happens. Include diagrams. If you give a direction for a current, state whether you are describing electron current or conventional current.

    Found on Page 796

  5. A capacitor is connected to batteries by Nichrome wires and allowed to charge completely. Then the plates are suddenly moved farther apart. Describe what happens and explain in detail why it happens, based on fundamental physical principles. If you give a direction for a current, state whether you are describing electron current or conventional current. Include appropriate diagrams to support your explanation.

    Found on Page 796

  6. How is the initial current through a bulb affected by putting a capacitor in series in the circuit? Explain briefly.

    Found on Page 794

  7. Someone said, “Current takes the path of least resistance.” What’s wrong with this statement?

    Found on Page 796

  8. What are the units of conductivity σ, resistivity ρ, resistance R, and current density J?

    Found on Page 796

  9. Which of the following are ohmic resistors? For those that aren’t, briefly state why they aren’t. (a) Nichrome wire, (b) a thin filament light bulb, (c) a plastic rod, (d) salt water, (e) silicon (a semiconductor)

    Found on Page 796

  10. A desk lamp that plugs into a wall socket can use a or a light bulb. Which bulb has the larger resistance? Explain briefly.

    Found on Page 796

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