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Electrical Resistance
Physical Science - Middle School
❮
1
/
2
❯
Electrical
Resistance
© Copyright NewPath Learning. All Rights Reserved. 94-4490
Visit
www.newpathlearning.com
for
Online
Learning
Resources.
temperature
resistance
copper
wire
-40
-40
-30
-20
-10
0
10
20
30
40
50
-20
0
20
40
60
80
100
120
60
70
80
90
100
140
160
180
200
copper
wire
temperature
resistance
Electrical
Resistance
An
electrical
current
is
affected
by
the
resistance
of
the
material
it
is
flowing
through.
Resistance
is
measured
in
units
called
ohms,
symbolized
by
the
Greek
letter
omega
(Ω). In equations, r
esistance
is
symbolized
with
an
R.
If
the
voltage
remains
the
same,
increasing
the
resistance
will
result
in
a
decrease
in
the
current.
Factors
that
affect
resistance
include
an
object’s
material,
temperature,
length
and
thickness.
15
20
30
40
70
OHM
S
D.
C.
OHM
S
100
20
0
50
0
10
5
4
3
2
1
0
100
80
60
40
20
0
A.C
.
300
240
180
120
60
0
Ohm
meter
Quantity
Measurement
Resistance
R
ohm
Unit
Symbol
Unit
of
Measure
Formula
Abbreviation
Resistance
Factors
-
Material
Materials
that
are
good
conductors
have
less
resistance,
because
their
electrons
are
held
loosely
on
the
atoms.
Materials
that
are
good
insulators
have
a
higher
resistance
because
their
electrons
are
held
tightly
together,
and
electrical
charges
have
difficulty
moving.
Resistance
=
Voltage
Current
10
=
120
V
12
A
10
=
30
V
3
A
more
resistance
longer,
thinner
wire
less
resistance
thicker
wire
Ohm’s
Law
Georg
Ohm,
a
Bavarian
mathematician
and
physicist,
defined
the
relationship
between
resistance,
voltage
and
current.
The
formula
for
this
relationship,
known
as
Ohm’s
Law,
is
resistance
equals
voltage
divided
by
current.
For
example,
if
the
voltage
of
a
toaster
is
120
volts
and
the
current
is
12
amps,
then
the
resistance
of
the
toaster
is
10
ohms.
Resistance
=
Voltage
Current
10
=
120
V
12
A
10
=
30
V
3
A
Resistance
Factors
-
Temperature
Some
materials
will
increase
in
resistance
as
the
temperature
increases.
Copper
atoms
within
a
wire
move
faster
as
they
gain
thermal
energy.
This
increased
molecular
movement
creates
resistance
by
slowing
down
the
flow
of
electric
charges
through
the
wire.
Resistance
Factors
-
Length
& Thickness
A
wire’s
length
and
thickness
affect
resistance.
Longer
wires
produce
more
resistance
than
shorter
wires.
As
the
electrical
charges
move
through
the
length
of
the
wire,
they
slow
down
as
they
collide
with
the
walls
of
the
wire.
Thinner
wires
are
more
resistant
than
thicker
wires.
Thin
wires
have
less
area
for
the
charges
to
flow
through,
and
therefore
the
current
is
slower
than
thick
wires.
Pause
and
Review
Use
the
formula
to
fill
in
the
missing
information
below.
Show
your
work.
© Copyright NewPath Learning. All Rights Reserved. 94-4490
Visit
www.newpathlearning.com
for
Online
Learning
Resources.
Electrical
Resistance
Resistance
=
Voltage
Current
10
=
120
V
12
A
10
=
30
V
3
A
220
Volts
11
Ω
amps
Current
:
15
20
30
40
70
OHM
S
D.
C.
OHM
S
100
20
0
50
0
10
5
4
3
2
1
0
100
80
60
40
20
0
A.C
.
300
240
180
120
60
0
Ohm
meter
Quantity
Measurement
Resistance
R
ohm
Unit
Symbol
Unit
of
Measure
Formula
Abbreviation
5
amps
20
Ω
V
Voltage
:
180
Volts
9
amps
Resistance
:
Ω
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