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Electromagnetism
Science, Grade 6
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Study Guide Electromagnetism Science, Grade 6
❮
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3
❯
ELECTROMAGNETISM
Overview
The
production
of
a
magnetic
field
around
an
electrical
current
is
called
electromagnetism.
This
is
shown
in
the
diagram
below.
LESSON
CHECKPOINT:
What
is
electromagnetism?
The
fact
that
electricity
alone
produces
magnetism
is
used
in
electromagnets
to
turn
on
and
turn
off
strong
magnetic
fields.
The
diagram
below
shows
an
electromagnet
being
used
to
ring
a
doorbell.
The
magnetic
field
produced
here
when
the
circuit
is
closed
is
a
combination
of
the
magnetic
force
from
the
electrical
current
and
the
metal
bar.
Opening
the
circuit
reduces
the
strength
of
the
magnetic
field
and
stops
the
clapper
from
striking
the
bell.
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In
junkyards,
large
electromagnets
held
by
cranes
are
used
to
lift
heavy
loads
of
metal.
When
current
is
flowing
the
metal
is
lifted
and
when
current
stops
flowing,
the
metal
drops
off
the
magnet.
Magnets
and
Motion
The
placement
of
an
electric
current
in
a
preexisting
magnetic
field
can
cause
motion.
When
this
happens,
electrical
energy
is
transformed
into
mechanical
energy.
The
use
of
electrical
energy
to
produce
mechanical
energy
is
the
principle
behind
the
workings
of
an
electric
motor.
In
a
motor,
the
polarity
of
an
electromagnet
is
continuously
reversed
within
an
existing
magnetic
field.
The
result
of
this
is
a
continuous
rotation
of
the
electromagnet
which
in
turn
is
connected
to
some
type
of
shaft
in
an
appliance
like
an
electric
drill.
LESSON
CHECKPOINT:
How
does
an
electric
motor
work?
Induction
A
generator
works
in
an
opposite
manner
from
a
motor.
By
moving
a
conductor
through
a
magnetic
field,
induced
electricity
is
produced
by
induction.
In
this
activity,
mechanical
energy
is
converted
to
electrical
energy.
In
the
diagram
below,
we
see
induction
occurring
in
two
different
ways:
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educational
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Generators
produce
almost
all
of
our
electricity.
By
burning
coal,
oil
or
natural
gas,
large
amounts
of
water
are
converted
to
steam
which
provides
the
mechanical
energy
needed
to
turn
the
generators.
In
some
cases,
falling
water
alone
is
enough
to
do
this
job.
LESSON
CHECKPOINT:
How
does
a
generator
work?
Managing
Electric
Flow
Transformers
are
used
to
either
increase
or
decrease
voltage.
Those
that
increase
the
voltage
are
called
step
up
transformers
and
those
that
reduce
the
voltage
are
called
step
down
transformers.
Without
transformers,
getting
electricity
from
power
plants
to
our
homes
would
be
impossible.
Coming
out
of
large
generators,
voltages
first
have
to
be
increased
to
be
carried
over
long
distances.
When
it
nears
our
homes,
these
high
voltages
have
to
be
reduced
to
safely
enter
and
then
work
our
appliances.
LESSON
CHECKPOINT:
What
are
the
two
types
of
transformers
and
what
does
each
type
do?
© Copyright NewPath Learning. All Rights Reserved.
Permission
is
granted
for
the
purchaser
to
print
copies
for
non-commercial
educational
purposes
only.
Visit
us
at
www.NewPathLearning.com.
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