ENGINEERING-43
Series-Parallel Circuits
Lab-06
Lab Data Sheet – ENGR-43 Lab-06
Lab Logistics
Experimenter:
Recorder:
Date:
Equipment Used (maker, model, and serial no. if available)
Directions
1. Check out a DMM.
2. Go to the side counter, collect resistors, “bread board”, and leads required to construct the
circuit shown in Figure 1.
3. Make the DMM-Measurements1 and Calculations needed to complete Table I
 Measure RT, the total circuit resistance, by removing the power supply, and applying in
the ohmmeter probes across the input & output circuit connections.
 Calculate RT using two different methods
o By the Series-Parallel calculation from the individually measured resistances
o By V/I using the measured values of Current & Voltage
 The experimenter must determine WHICH I & V to use in this calculation
4. Return all lab hardware to the “as-found” condition
1
CAREFULLY Select the DMM range such that meter displays at least FOUR (4) digits. All DMM measurements
should be reported to 4 significant figures
© Bruce Mayer, PE • Chabot College • 282235922 • Page 1
NOTE
The Ammeter MUST be connected in series with NO potential across it; i.e.,
do NOT connect the ammeter ACROSS Vs or any R.
Figure 1 • Series-Parallel Circuit.
- Vs = 10.00 Vdc.
- R1 = 0.8-4 kΩ = R2 = 0.8-4kΩ = R3 = 0.8-4 kΩ. R4 = 1.2-9 kΩ.
- R1, R2, R3 to have the SAME nominal (color-coded) value.
- The R1,2,3:R4 Resistance RATIO to be in the range of 1.5-6
.
© Bruce Mayer, PE • Chabot College • 282235922 • Page 2
 Actual Values
Vs =
R1 =
R2 =
R3 =
R4 =
Table I – Full Circuit Characterization
Value Determination
RT (note1)
RT (note2)
VR1
VR2
VR3
VR4
I1
I23
Calculated
Measured
%



Note1: Calculate by Series-Parallel combination using the Actual Values for resistors R1-R4 as determined by OhmMeter
measurement
Note2: Calculate using appropriate I & V measurements
% calculation
 % = 100x(Valuecalc – Valuemeas)/Valuemeas
Run Notes/Comments
© Bruce Mayer, PE • Chabot College • 282235922 • Page 3
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