Download Magnets in Everyday Use

Magnets in
Everyday Use
Magnets in
Everyday Use
This book was developed in collaboration with Region 4 Education Service Center, Houston, Texas.
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DYK
Did
You
Know?
Did You Know?
Magnets in
Everyday Use
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DYK
Did
You
Know?
Did you know there is a magnet
in a motor?
magnet
magnet
small motor
magnet
World’s Simplest Motor™
The electricity coming into the motor causes
the pair of magnets to push and pull on the coil
of wires. The coil of wires spins, turning the
motor’s shaft. That spinning can make all kinds
of things move, like wheels in a motorized toy
car.
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Larger motors have bigger magnets that
move things like gears.
It is not OK to take apart objects like motors, headphones,
and speakers on your own. These devices use electricity
and could shock you. You cannot see electricity, so you
do not want to play with objects that might hurt you.
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DYK
Did
You
Know?
Did you know there are magnets
in headphones and in speakers?
magnet
headphones
headphones with
earphone speaker
unassembled
The wires of the headphones carry a signal to
the earphone, making the magnet push and pull
on a coil of wires, which moves the diaphragm
of the earphones. The vibrations create the
sound you hear.
Never open a speaker that is connected to a power source.
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DYK
Did
You
Know?
Did you know a generator is just
a motor working backward?
hand crank generator
generator
A force spins the shaft, which turns the coil of
wire inside the motor, generating electricity.
There are huge magnets in the generators that
make the electricity that powers our school and
your home.
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DYK
Did
You
Know?
Did you know there is a train that
moves without wheels by using
magnetism?
What sounds like “magnet” in the name “maglev”?
mag = magnetism
lev = levitate
A maglev train uses magnetism to levitate the
train and push it along the track. Since the train
levitates above the track, it does not experience
wear and tear from wheels rolling on the tracks.
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Maglev trains are the fastest train of any type. The fastest maglev
train, as of 2012, was a superconducting maglev in Japan, which
could travel up to 361 mph. Right now there are no maglev trains
in the United States, but there are several projects being planned.
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DYK
Did
You
Know?
Did you know an electromagnet
is created when a coil of wire is
wound around an iron core and
electric current flows through it?
electromagnet
To make a job easier, large electromagnets may
be used to lift heavy materials.
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DYK
Did
You
Know?
Did you know magnets help
make things around your house
work?
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DYK
Did
You
Know?
Did you know there are many
everyday uses of magnets?
You can find a magnetic strip
along the door of a refrigerator
to help it seal tightly and stay
shut.
You can find a magnet on
an electric can opener. The
magnet holds the lids of cans
as they are opened.
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You can find a magnetic
strip on the back of
many debit and credit
cards. There is important
information stored in the
strip.
The needle of a
compass is a magnet.
The needle points to
Earth’s magnetic north
pole.
A compass is a tool to use if you have lost your
way.
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Which of these magnets do you use every day?
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Magnets in
Everyday Use