Kreutter/Costello: DC Circuits 3
for
Searching
in
Patterns
and
Construct the following series
and
Series
parallel
Parallel
Circuits
in the Circuit
circuits
Construction
Kit.
After
building each
in the wires
and
the
circuit,
simulated
circuit,
use the
ammeter and
potential difference
What
patterns
do you
voltmeter to measure the current
across
(voltage)
come up with
as you
each
light
build the
bulb in the
circuits?
Note: When finding the total potential difference (voltage) for the entire
circuit (tVtotai) we are not looking for the sum of all the voltmeter
Instead, find the potential difference (voltage) across the entire circuit, as
shown in the diagrams below. When finding the total current ( ‘Total) we are again
not looking for the sum of all the ammeter readings, but the total current for
the entire circuit.
readings.
3.1
Current
through
I
each
Ammeter
=
12
Potential Difference
(voltage) across each
element
Patterns in current
Patterns in potential
difference
i’I
11111
=
(voltage)
‘:
3.2
I
Current
through
=
(2
each
12
Ammeter
ç)L
—G
‘total =
Potential
Difference
AVbattery
=
(voltage)
Across
(
v)J
each
Element
2
AV
AVtotai across bulbs =
/
Patterns in
current
Patterns in
potential
difference
(voltage)
A
4
A)
)otai across bulbs
rfCostello: DC Circuits 3
Current
through
Each
Ammeter
‘2 =D
I:.
13
A
‘total
LI Vbattery
Potential
Difference
1
“V
(voltage)
Across
2
“V
each
Element
=
ow
Patterns
in current
Patterns
in
potential
difference
3.4
Current
through each
Ammeter
=
12
=
13
=
14
=
0
‘total
Potential
Difference
(voltage)
Across each
Element
IlVbattery
1
1W
=
=
1W3
=
Vtotai
Patterns in
current
Patterns in
potential
difference
(voltage)
‘
=
‘
‘lv
/Costello: DC Circuits 3
3,5
Current through
Each Ammeter
Potential
Difference
(voltage) Across
each Element
Patterns in
Current
Patterns in
potential
difference
(voltage)
I
=
Vbatterjes
1
LW
=
=
3.6
Current
through Each
Ammeter
I
Potential
Vbattepjes
Difference
(voltage)
Across each
Element
Patterns in
current
Patterns in
potential
difference
(voltage)
1
LW
=
=
3,7 Summarize your findings:
Parallel
Series
Batteries:
Batteries:
Current through light bulbs:
(
Current through light bulbs
Potential difference across light bulbs:
Potential Difference across light bulbs:
A
t_
1
%
Circuitunctions
Develop a rule for the current going
into and coming out of a junction.
ircuits Løops
Develop a rule for the potential
difference (voltage) of all elements in
a loop.
b
utter/Costello: DC Circuits 3
3.8 Observe and Explain The readings of
three ammeters are shown at the right, What
can you say about the magnitude of the
current through each of the light bulbs?
Explain the pattern.
10 mA
I
3,9 Predict
(a) For the diagram to the right use the
analogies and the ideas of potential
differenCe and current to rank the brightness
of the bulbs. List the brightest bulb first.
Indicate whether any bulbs are equally bright.
Explain your ratings.
(b) Check your prediction using the PhET
Circuit Construction Kit and write your
conclusions.
—