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Chapter 20: Electric Current, Resistance, and Ohm's Law

College Physics (Urone)
Pages: 701 - 738

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129 Questions for Chapter 20: Electric Current, Resistance, and Ohm's Law

  1. Does the resistance of an object depend on the path current takes

    Found on Page 731
  2. A clock battery wears out after moving 10000C of charge through the clock at a rate of 0.500 mA.

    Found on Page 733
  3. If aluminium and copper wires of the same length have the same

    Found on Page 731
  4. The batteries of a submerged non-nuclear submarine supply 1000 A at full speed ahead. How long does it take to move Avogadro’s number 6.023 x 1023 of electrons at this rate?

    Found on Page 733
  5. Explain why R=R0(1+α△T)for the temperature variation of the

    Found on Page 731
  6. Electron guns are used in X-ray tubes. The electrons are accelerated through a relatively large voltage and directed onto a metal target, producing X-rays. (a) How many electrons per second strike the target if the current is 0.500 mA ? (b) What charge strikes the target in 0.750 s?

    Found on Page 733
  7. Why do incandescent lightbulbs grow dim late in their lives, particularly just before their filaments break?

    Found on Page 731
  8. A large cyclotron directs a beam of He++ nuclei onto a target with a beam current of 0.250 mA.

    Found on Page 733
  9. The power dissipated in a resistor is given by P=V2/R, which means power decreases if resistance increases. Yet this power is also given by P=I2R, which means power increases if resistance increases. Explain why there is no contradiction here.

    Found on Page 731
  10. Repeat the above example on Example 20.3, but for a wire made of silver and given there is one free electron per silver atom.

    Found on Page 701

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