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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