Richland College
Engineering Business & Technology
Rev. 0 – W. Slonecker
Rev. 1 (8/24/10)– J. Bradbury
DC Circuits
CETT 1403
DC Circuits Lab 05
Parallel Circuits
Name: ____________________________________ Date: ____________________
OBJECTIVES:
To analyze Parallel Circuits for R, I, and V.
To analyze Parallel Circuits by calculations and by
measurements.
MATERIALS:
DC Power Supply: 0 35 Volts
Digital Multimeter
Breadboard
Resistors: 680 Ω, 1.2kΩ, 2.2kΩ
NOTE: On a calculation sheet, draw the schematic, label the parts and values.
Show the readings taken at the points on your schematic. Record
answers and findings on these lab sheets.
PROCEDURES:
I
1. Enter the color code and the measure value of the following components.
Resistor
Color Code
Measured Value
R
1
=
680 Ω
_________
____________Ω
R
2
=
1.2 kΩ
_________
___________kΩ
R
3
=
2.2 kΩ
_________
___________kΩ
II
2. Set up the following circuit. Using the color code and measured values
from step 1 calculate I
T
and R
T
.
Using color code values.
Using measured values.
Calculated I
T
= _____
mA.
Calculate I
T
= _____m
A.
Calculated R
T
= _____kΩ.
Calculate R
T
= _____kΩ.
Measured I
T
= ______mA
Measured R
T
= _____kΩ
Page
1
of
4
III
1. Set up the following parallel circuit.
2. In a parallel circuit the following formulas apply.
1/R
T
= 1/R
2
+ 1/R
3
(R
Ta
)
R
T
= R
2
R
3
/(R
2
+ R
3
) (R
Tb
)
R
T
= V
T
/I
T
(R
Tc
)
3. Using the proper measuring procedures complete Table 1.
MEASURED
CALCULATED
V
R2
=
XXX
V
R3
=
XXX
I
R2
=
I
R2
=
I
R3
=
I
R3
=
I
T
=
I
T
=
R
T
=
R
T(a)
=
XXX
R
T(b)
=
XXX
R
T(c)
=
Table 1
4. Measure R
T
with power supply
OFF
but in the circuit: R
T
= _____.
Measure R
T
with power supply leads removed: R
T
= _____.
Why the difference?
5. Draw the equivalent series circuit for the parallel circuit shown in step
2.
Label and show the values of all components in the equivalent circuit.
Page
2
of
4
IV
1. Set up the circuit shown below. (see step II for calculating R
T
’s.)
2. Complete Table 2. Do your calculations and schematic on a separate sheet,
showing formulas used to obtain the results. Attach sheet to lab.
MEASURED
CALCULATED
V
T
=
XXX
V
R1
=
XXX
V
R2
=
XXX
V
R3
=
XXX
I
T
=
I
T
=
I
R1
=
I
R1
=
I
R2
=
I
R2
=
I
R3
=
I
R3
=
R
T
=
R
T(a)
=
R
T(b)
=
R
T(c)
=
Table 2
3. Draw the series equivalent circuit, label and show the value of components.
Page
3
of
4
V
1. Visual Representation of what you did:
! ! FILL IN THE BLANKS ! !
How much current flows through section, A_____, B_____ and C_____?
CONCLUSION:
What I learned from this lab: (Use back of this page as needed.)
What still confuses me:
Page
4
of
4
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