Schaum's Outline of College Physics, Twelfth Edition (Schaum's Outlines)
12th Edition
ISBN: 9781259587399
Author: Eugene Hecht
Publisher: McGraw-Hill Education
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Chapter 27, Problem 32SP
Power is transmitted at 80 kV between two stations. If the voltage can be increased to 160 kV without a change in cable size, how much additional power can be transmitted for the same current? What effect does the power increase have on the line heating loss?
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Chapter 27 Solutions
Schaum's Outline of College Physics, Twelfth Edition (Schaum's Outlines)
Ch. 27 - 11. If the current supplied to a resistor is...Ch. 27 - 12. A 12.0-V battery supplies 20.0 mA to a...Ch. 27 - 13. A length of wire has a certain current...Ch. 27 - 14. A 12.0-V battery is put across a 100-Ω...Ch. 27 - 15. A 12.0-V car battery supplies 15.0 A to a...Ch. 27 - 16. A resistive heater is labeled 1600 W/120 V....Ch. 27 - Prob. 17SPCh. 27 - 18. A spark of artificial 10.0-MV lightning had...Ch. 27 - Prob. 19SPCh. 27 - 20. An electric motor takes 15.0 A at 110 V....
Ch. 27 - 21. A current of 10 A exists in a line of 0.15 Ω...Ch. 27 - Prob. 22SPCh. 27 - 23. A 25.0-W, 120-V bulb has a cold resistance...Ch. 27 - 24. While carrying a current of 400 A, a...Ch. 27 - 25. How much power does a 60-W/120-V...Ch. 27 - Prob. 26SPCh. 27 - 27. A 10.0-Ω electric heater operates on a 110-V...Ch. 27 - 28. An electric motor, which has 95 percent...Ch. 27 - 29. An electric crane uses 8.0 A at 150 V to...Ch. 27 - Prob. 30SPCh. 27 - 31. Compute the cost per hour at 8.0 / kW • h of...Ch. 27 - 32. Power is transmitted at 80 kV between two...Ch. 27 - 33. A storage battery, of emf 6.4 V and internal...Ch. 27 - 34. A tank containing 200 kg of water was used...
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- "Thermal energy" situations exist everyday in our homes, but we don't call them "thermal energy" applications. We call them baking, cooking, or turning up the house heater. Let's look at a small hair dryer that draws 10A of current under a typical household 120V voltage. What is the power rating of the hair dryer in watts? Depending on the application, the time unit of minutes or hours are preferred over the time unit of seconds often used in physics. Utility companies use kilowatt-hour units for energy rather than the watt-second units. These units are more practical given how much energy a home uses. Let's say you run the hair dryer 6 minutes to dry your hair. How much energy was used in Watt-hour units? What is this energy in kilowatt-hours (kWh) ? Electricity is not free. Someone pays the electric utility bill so you can run the hair dryer, heat the home, cook and bake. The average electricity rate in the U.S. is about 10 cents per kilowatt-hour. (By the way, the state of…arrow_forwardIn a household, a business is run for an average of 6 hours per day. The total power consumed by a computer and its printer is 205 watts. In addition, a 90-W light bulb runs during the same 6 hours. If their utility charges 11.75 cents per kWh, how much do the owners pay every 30-days?arrow_forwardThe average television is said to be on 6 hours per day. Estimate the yearly cost of electricity to operate 100 million TVs, assuming their power consumption averages 150 W and the cost of electricity averages 12.0 cents/kW⋅arrow_forward
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