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Magnetism
the BIG idea
Current can produce magnetism, and magnetism can produce current.
7.1
Magnetism is a force that acts at a distance.
7.2
Current can produce magnetism.
7.3
Magnetism can produce current.
7.4
Generators supply electrical energy.
CHAPTER OUTLINE
CHAPTER RESOURCES
CHAPTER HOME
KEY CONCEPT
7.1
Magnetism is a force that acts at a distance.
VOCABULARY
All magnets have a north and south pole. The like
poles of two magnets repel each other and the
opposite poles attract.
magnet
magnetism
magnetic pole
N
S
magnetic field
magnetic domain
N
S
N
S
S
N
CHAPTER
RESOURCES
SECTION
OUTLINE
7.2
CHAPTER HOME
KEY CONCEPT
Current can produce magnetism.
A magnet that is produced by electric current is called
an electromagnet.
VOCABULARY
electromagnetism
electromagnet
coil
iron core
S
N
SIMULATION
Explore how current
and magnetism are
related.
CHAPTER
RESOURCES
SECTION
OUTLINE
7.2
CHAPTER HOME
KEY CONCEPT
Current can produce magnetism.
A magnet that is produced by electric current is called
an electromagnet. Motors use electromagnets to
convert electrical energy into the energy of motion.
Motor
VOCABULARY
electromagnetism
electromagnet
magnet
CHAPTER
RESOURCES
electromagnet
SECTION
OUTLINE
7.2
CHAPTER HOME
KEY CONCEPT
Current can produce magnetism.
A magnet that is produced by electric current is called
an electromagnet. Motors use electromagnets to
convert electrical energy into the energy of motion.
VISUALIZATION
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See a motor in motion.
VOCABULARY
electromagnetism
electromagnet
CHAPTER
RESOURCES
SECTION
OUTLINE
7.3
CHAPTER HOME
KEY CONCEPT
Magnetism can produce current.
VOCABULARY
Magnetism can be used to produce electric current. In
a generator the energy of motion is converted into
electrical energy.
generator
direct current
alternating current
transformer
Generator
magnet
electromagnet
CHAPTER
RESOURCES
SECTION
OUTLINE
7.4
CHAPTER HOME
KEY CONCEPT
Generators supply electrical energy.
Generators at power plants use large magnets to
produce electric current, supplying electrical energy to
homes and businesses.
step-up
transformers
VOCABULARY
electric power
watt
kilowatt
step-down
transformers
kilowatt-hour
generator
shaft
turbine
CHAPTER
RESOURCES
SECTION
OUTLINE
7.1
KEY CONCEPT
CHAPTER HOME
Magnetism is a force that acts at a distance.
I. Magnetism is a force that acts at a distance.
A. Magnets attract and repel other magnets.
1. Magnetism
2. Magnetic Poles
3. Magnetic Fields
VOCABULARY
magnet
magnetism
magnetic pole
magnetic field
magnetic domain
B. Some materials are magnetic.
1. Inside Magnetic Materials
2. Temporary and Permanent Magnets
C. Earth is a magnet.
1. Earth’s Magnetic Field
2. Magnetism and the Atmosphere
CHAPTER
RESOURCES
KEY CONCEPT
SUMMARY
7.2
KEY CONCEPT
CHAPTER HOME
Current can produce magnetism.
II. Current can produce magnetism.
A. An electrical current produces a magnetic field.
VOCABULARY
electromagnetism
electromagnet
1. Electromagnetism
2. Making an Electromagnet
3. Uses of Electromagnets
B. Motors use electromagnets.
1. Motors
2. Uses of Motors
CHAPTER
RESOURCES
KEY CONCEPT
SUMMARY
7.3
KEY CONCEPT
CHAPTER HOME
Magnetism can produce current.
III. Magnetism can produce current.
A. Magnets are used to generate an electric
current.
1. Generating an Electric Current
VOCABULARY
generator
direct current
alternating current
transformer
2. Direct and Alternating Currents
B. Magnets are used to control voltage.
CHAPTER
RESOURCES
KEY CONCEPT
SUMMARY
7.4
KEY CONCEPT
CHAPTER HOME
Generators supply electrical energy.
IV. Generators supply electrical energy.
A. Generators provide most of the world’s electrical
energy.
1. Generating Electrical Energy
VOCABULARY
electric power
watt
kilowatt
kilowatt-hour
B. Electrical power can be measured.
1. Watts and Kilowatts
2. Calculating Energy Use
CHAPTER
RESOURCES
KEY CONCEPT
SUMMARY
CHAPTER HOME
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