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3_Chapter 16 HomeworkCH17 Current and Resistance

3_Chapter 16 HomeworkCH17 Current and Resistance - Current...

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Current and Resistance 71 Answers to Even Numbered Conceptual Questions 2. In the electrostatic case in which charges are stationary, the internal electric field must be zero. A nonzero field would produce a current (by interacting with the free electrons in the conductor), which would violate the condition of static equilibrium. In this chapter we deal with conductors that carry current, a nonelectrostatic situation. The current arises because of a potential difference applied between the ends of the conductor, which produces an internal electric field. 4. The number of cars would correspond to charge Q . The rate of flow of cars past a point would correspond to current. 6. The 25 W bulb has the higher resistance. Because () 2 RV =∆ P , and both operate from 120 V, the bulb dissipating the least power has the higher resistance. The 100 W bulb carries more current, because the current is proportional to the power rating of the bulb.
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