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Transcript

SECTION GENERATORS SUPPLY ELECTRICAL ENERGY. 7.4 Reading Study Guide A BIG IDEA Current KEY CONCEPT can produce magnetism, and magnetism can produce current. Generators supply electrical energy. Vocabulary electric power rate at which electrical energy is generated from another energy source watt unit of measurement for power kilowatt unit of power equal to one thousand watts kilowatt-hour one kilowatt of power for a one-hour period Review 1. A generator changes ____________ energy into ____________ energy. Take Notes I. Generators provide most of the world’s electrical energy. Complete the graphic organizer. List ﬁve sources of energy used to turn a power plant’s generators. Falling Water Generator Electrical Energy A–B. Generating Electrical Energy 3. Summarize the three steps of how electric power is generated. (Hint: Refer to the diagram in your textbook.) 1. 2. 3. ELECTRICITY AND MAGNETISM, CHAPTER 7, READING STUDY GUIDE A 169 CHAPTER 7 Magnetism Copyright © by McDougal Littell, a division of Houghton Mifﬂin Company 2. II. Electric power can be measured. 4. Why do power companies need to know the rate at which energy is used? A. Watts and Kilowatts 5. What does a watt measure? 6. The formula used to calculate electric power is P⫽VpI What do the variables stand for? In what units are answers represented? 7. What does the preﬁx kilo stand for? How are watts and kilowatts related? 8. What is the formula used to ﬁnd the amount of energy your household uses? 9. If a 3 kW clothes dryer runs for 2 hours, how much energy will it use? 170 ELECTRICITY AND MAGNETISM, CHAPTER 7, READING STUDY GUIDE A Copyright © by McDougal Littell, a division of Houghton Mifﬂin Company CHAPTER 7 Magnetism B. Calculating Energy Use