Physics for Scientists and Engineers 8ed - ch28 - end of chapter questions

# Physics for Scientists and Engineers 8ed - ch28 - end of chapter questions

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Questions W denotes answer available in Student Solutions Manual/Study Guide; O denotes objective question 1. Is the direction of current in a battery always from the negative terminal to the positive terminal? Explain. 2. O A certain battery has some internal resistance. (i) Can the potential difference across the terminals of a battery be equal to its emf? (a) No. (b) Yes, if the battery is absorbing energy by electrical transmission. (c) Yes, if more than one wire is connected to each terminal. (d) Yes, if the current in the battery is zero. (e) Yes; no special condition is required. (ii) Can the terminal voltage exceed the emf? Choose your answer from the same possibilities. 3. Given three lightbulbs and a battery, sketch as many different electric circuits as you can. 4. O When resistors with different resistances are connected in series, which of the following must be the same for each resistor? Choose all correct answers. (a) potential difference (b) current (c) power delivered (d) charge entering (e) none of these answers 5. O When resistors with different resistances are connected in parallel, which of the following must be the same for each resistor? Choose all correct answers. (a) potential difference (b) current (c) power delivered (d) charge entering (e) none of these answers 6. Why is it possible for a bird to sit on a high-voltage wire without being electrocuted? 7. O Are the two headlights of a car wired (a) in series with each other, (b) in parallel, (c) neither in series or in parallel, or (d) is it impossible to tell? 8. A student claims that the second of two lightbulbs in series is less bright than the first, because the first lightbulb uses up some of the current. How would you respond to this statement? 9. O Is a circuit breaker wired (a) in series with the device it is protecting, (b) in parallel, (c) neither in series or in parallel, or (d) is it impossible to tell? 10. O In the circuit shown in Figure Q28.10, each battery is delivering energy to the circuit by electrical transmission. All the resistors have equal resistance. (i) Rank the electric potentials at points a , b , c , d , e , f , g , and h from highest to lowest, noting any cases of equality in the ranking. (ii) Rank the magnitudes of the currents at the same points from greatest to least, noting any cases of equality. 11. O A series circuit consists of three identical lamps connected to a battery as shown in Figure Q28.11. The switch S, originally open, is closed. (i) What then happens to the brightness of lamp B? (a) It increases. (b) It decreases somewhat. (c) It does not change. (d) It drops to zero. (ii) What happens to the brightness of lamp C? Choose from the same possibilities. (iii) What happens to the current in the battery? Choose from the same possibilities. (iv) What happens to the potential difference across lamp A? (v) What happens to the potential difference across lamp C? (vi) What happens to the total power delivered to the lamps by the battery? Choose in each case from the same

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Physics for Scientists and Engineers 8ed - ch28 - end of chapter questions

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