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Chapter Resources
8
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Image Bank
Foldables
Video Clips and Animations
Chapter Summary
Chapter Review Questions
Standardized Test Practice
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Chapter Resources
5
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Image Bank
8
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8
Transfer Images
To transfer images to your own power point follow
the following steps:
• Open the “Resource” file from the CD-ROM disc –
view the file in the “normal view” or “slide sorter
view” mode - go to slide #2 – from there you can
click through the images and follow these
instructions. Click once on the image.
• Copy the image
• Go to your own power point document
• Paste the image.
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Image Bank
8
Magnetite
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8
Magnetic Field
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8
Horseshoe and Disk Magnets
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Compass
Needles on a
Bar Magnet
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Compass Needle Alignment
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Magnetic Nail
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Magnetic Domains
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Broken
Magnetic
Poles
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Magnetic Field Current in Wire
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Magnetic Field Wire Loop
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Magnetic Field Wire
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Magnetic Iron Core
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8
Speaker
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8
Electromagnet
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Galvanometer
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Fan
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Electric Motor
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Turning Motor
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Current Direction Change
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Motor Forces
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Concept Map-Left
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Concept Map
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Power Plant
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Wind Farm
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Alarm Clock
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8
Power Lines
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8
Transformer
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Step Down Transformer
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Creating Electricity
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Foldables
8
Using Magnets
Many devices you use contain magnets that help
convert one form of energy to another. Make
the following Foldable to help you understand
how magnets are used to transform electrical
and mechanical energy.
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Foldables
8
Fold a sheet of
paper in half
lengthwise.
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Foldables
8
Fold the paper
down about 2 cm
from the top.
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Foldables
8
Open and draw lines
along the top fold.
Label as shown.
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Foldables
8
Summarize
As you read the chapter, summarize how
magnets are used to convert electrical energy
to mechanical energy in the left column, and
how magnets are used to convert mechanical
energy to electrical energy in the right column.
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Video Clips and Animations
8
Click image to play movie
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To view the next video
clip or animation click
here.
Video Clips and Animations
8
Click image to play movie
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Reviewing Main Ideas
8.1
Magnetism
• A magnetic field surrounds a magnet and
exerts a magnetic force.
• All magnets have two poles: a south pole and
a north pole.
• Opposite poles of magnets attract; like poles
repel.
• Groups of atoms with aligned magnetic poles
are called magnetic domains.
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Reviewing Main Ideas
8.2
Electricity and Magnetism
• An electric current flowing through a wire
produces a magnetic field.
• An electric current passing through a coil of
wire can produce a magnetic field inside the
coil. The coil becomes an electromagnet.
One end of the coil is the north pole, and the
other end is the south pole.
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Reviewing Main Ideas
8.2
Electricity and Magnetism
• The magnetic field around an electromagnet
depends on the current and the number of
coils.
• An electric motor contains a rotating
electromagnet that converts electrical energy
to mechanical energy.
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Reviewing Main Ideas
8.3
Producing Electric Current
• By moving a magnet near a wire, you can
create an electric current in the wire. This is
called electromagnetic induction.
• A generator produces electric current by
rotating a coil of wire in a magnetic field.
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Reviewing Main Ideas
8.3
Producing Electric Current
• Direct current flows in one direction through
a wire; alternating current reverses the
direction of current flow in a regular pattern.
• The number of turns of wire in the primary
and secondary coils of a transformer
determines whether it increases or decreases
voltage.
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Chapter Review
8
Question 1
What do magnetic field lines connect?
A.
B.
C.
D.
magnetic domains
north pole and south pole of a magnet
north poles within a magnetic domain
south poles within a magnetic domain
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Chapter Review
8
Answer
The answer is B.
The magnetic field
can be represented
by lines of force,
or magnetic field
lines.
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Chapter Review
8
Question 2
What two things are found on all magnets?
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Chapter Review
8
Answer
All magnets have
two poles: a south
pole and a north
pole.
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Chapter Review
8
Question 3
Which of these is a single wire wrapped into a
cylindrical wire coil?
A.
B.
C.
D.
domain
pole
solenoid
turbine
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Chapter Review
8
Answer
The answer is C. When current flows through a
solenoid, the magnetic field inside it is stronger
than the magnetic field inside a single loop.
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Chapter Review
8
Question 4
Why are electromagnets temporary magnets?
Answer
An electromagnet is a temporary magnet
because the magnetic field is present only
when current is flowing in the solenoid.
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Chapter Review
8
Question 5
Which reverses the direction of current in a
regular pattern?
A.
B.
C.
D.
alternating current
direct current
electromagnet
magnetic domain
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Chapter Review
8
Answer
The answer is A. Alternating current reverses
the direction of current in a regular pattern.
Direct current flows in only one direction
through a wire.
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Standardized Test Practice
8
Question 1
Which is best represented by the diagram?
A. aluminum foil
B. nail in contact
with a magnet
C. normal iron nail
D. glass
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Standardized Test Practice
8
Answer
The answer is B. A normal iron nail’s
microscopic domains are arranged randomly.
Contact with a magnet causes them to become
temporarily aligned.
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Standardized Test Practice
8
Question 2
Which is true of a temporary magnet?
A. A magnetic field prevents the domains from
aligning.
B. A magnetic field causes domains to align.
C. The domains cannot return to random
alignment after a magnetic field is removed.
D. Randomly aligned domains cannot be
aligned.
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Standardized Test Practice
8
Answer
The answer is B. In a temporary magnet, the
domains return to random alignment when the
field is removed.
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Standardized Test Practice
8
Question 3
A transformer has 50 turns of wire in the
primary coil and 250 turns of wire in the
secondary coil. The output voltage is 120 V.
What is the input voltage?
A. 240 V
B. 24 V
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C. 12 V
D. 6 V
Standardized Test Practice
8
Answer
The answer is B. This is a step-up transformer
that has 5 times as many turns of wire in the
secondary coil as the primary coil has.
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Standardized Test Practice
8
Question 4
What is the output voltage from a transformer if
a direct current flows through the primary coil?
A.
B.
C.
D.
half the input voltage
ten times the input voltage
twice the input voltage
zero
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Standardized Test Practice
8
Answer
The answer is D. If direct current flows through
the primary coil, the direction of the field does
not change. It is the changing magnetic field
that induces an alternating current in the
secondary coil.
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Standardized Test Practice
8
Question 5
A transformer has 400 turns of wire in the
primary coil and 20 turns of wire in the
secondary coil. If the input voltage is 440 V,
what is the output voltage?
A. 440 V
B. 220 V
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A. 120 V
B. 22 V
Standardized Test Practice
8
Answer
The answer is D. In this step-down transformer,
the input voltage is twenty times the output
voltage.
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