RESISTORS
“SHARING”
VOLTAGE
PERCENTAGE
INVESTIGATION
•  Set
up
a
series
circuit
with
three
1000‐Ω
resistors
only.
•  Measure
and
record
the
voltage
drop
across
each
resistor.
•  Record
and
analyze
your
results.
PERCENTAGE
INVESTIGATION
•  What
is
the
total
resistance
in
the
three‐
resistor
circuit?
•  3000‐Ω
•  This
means
3000
Ω
equals
100%
of
the
resistance
in
the
circuit.
•  What
percentage
of
the
resistance
is
contributed
by
resistor
1?
•  1000
Ω
÷
3000
Ω
×
100
=
33.3%
PERCENTAGE
INVESTIGATION
•  What
is
the
total
voltage
available
in
the
circuit?
•  The
voltage
across
the
baVery
terminals
–
probably
in
the
neighborhood
of
8
V
at
this
point
in
the
course.
•  Okay,
8
V
is
100%
of
the
voltage
available
in
the
circuit.
•  How
much
voltage
is
dropped
by
resistor
1?
•  About
2.7
V
•  What
is
the
percentage
of
the
voltage
drop
caused
by
resistor
1?
•  2.7
V
÷
8
V
×
100
=
34%
THREE
GREAT
TRUTHS
1.  The
sum
of
the
component
voltage
drops
in
a
series
circuit
is
equal
to
the
voltage
of
the
source.
2.  The
greater
the
resistance
of
a
resistor,
the
more
voltage
it
drops.
3.  In
a
series
circuit,
the
percentage
of
resistance
contributed
by
a
component
is
equal
to
the
percentage
of
voltage
dropped
by
that
component.
ASSIGNMENT
•  DO
RESPONSE
SHEET
–
VOLTAGE
•  READ
THE
ARTICLE
CALLED
THE
THREE
GREAT
TRUTHS
OF
CIRCUITRY
IN
TEXTBOOK