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Chapter 21: Circuits and DC Instruments

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College Physics (Urone)
Pages: 739 - 778
College Physics (Urone)

College Physics (Urone)

Book edition 1st Edition
Author(s) Paul Peter Urone
Pages 1272 pages
ISBN 9781938168000

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Illustration

120 Questions for Chapter 21: Circuits and DC Instruments

  1. Suppose you are doing a physics lab that asks you to put a resistor into a circuit, but all the resistors supplied have a larger resistance than the requested value. How would you connect the available resistances to attempt to get the smaller value asked for?

    Found on Page 771

  2. \ (240 {\ rm {}} kV \) tran力量smission line carrying \(5.00 \times {10^2}\;A\)is hung from grounded metal towers by ceramic insulators, each having a \(1.00 \times {10^9}{\rm{ }}\Omega \) resistance. Figure \(21.51\).

    Found on Page 775

  3. Before World War II, some radios got power through a “resistance cord” that had a significant resistance. Such a resistance cord reduces the voltage to a desired level for the radio’s tubes and the like, and it saves the expense of a transformer. Explain why resistance cords become warm and waste energy when the radio is on.

    Found on Page 771

  4. Show that if two resistors R1and R2are combined and one is much greater than the other (R1>>R2): (a) Their series resistance is very nearly equal to the greater resistance R1(b) Their parallel resistance is very nearly equal to smaller resistanceR2 .

    Found on Page 775

  5. Some light bulbs have three power settings (not including zero), obtained from multiple filaments that are individually switched and wired in parallel. What is the minimum number of filaments needed for three power settings?

    Found on Page 771

  6. Two resistors, one having a resistance of 145Ω, are connected in parallel to produce a total resistance of 150Ω. (a) What is the value of the second resistance? (b) What is unreasonable about this result? (c) Which assumptions are unreasonable or inconsistent?

    Found on Page 775

  7. Is every emf a potential difference? Is every potential difference an emf? Explain.

    Found on Page 771

  8. Two resistors, one having a resistance of900kΩ, are connected in series to produce a total resistance of 0.5MΩ. (a) What is the value of the second resistance? (b) What is unreasonable about this result? (c) Which assumptions are unreasonable or inconsistent?

    Found on Page 775

  9. Found on Page 771

  10. Standard automobile batteries have six lead-acid cells in series, creating a total emf of 12.0 V. What is the emf of an individual lead-acid cell?

    Found on Page 775

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