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EE 300
Experiment #2
Series and Parallel Resistive Circuits
Scott Finnesand
Lab Partner: Garet Miller
Instructor: Barun Ranjikar
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View Full Document Objective:
The objective of this experiment is to study resistors connected in series,
parallel, and seriesparallel network topology.
Both prelab, theoretical analysis and
experimental results will be used to examine the circuits.
Introduction:
In this lab resistors connected in series, parallel, and combinations of the
two will be looked at.
The formula for finding the equivalent resistance in series is
R
eq
=R1+R2+R3.
Also when resistors are connected in series, the same current passes
through each resistor.
From this the voltage drop across each resistor can be determined.
The formula for determining the voltage across each resistor is
eq
S
R
R
V
V
1
1
=
.
In part two
of the experiment, resistors in parallel are examined.
The equivalent resistance for
resistors in parallel can be found using
1
3
1
2
1
1
1

+
+
=
R
R
R
R
eq
.
When resistors are in
parallel, the same resistors have the same voltage drop across each, but the current differs
for each resistor.
The current across each resistor can be found using the following
equation:
1
1
R
R
I
I
eq
s
=
.
When considering mix series and parallel combinations these
principles can be applied.
Procedures
:
Resistors in Series
1.
Connect the three resistors of figure 1 together in series and measure the
equivalent resistance using a multimeter before the voltage source is connected
to the circuit.
2.
Connect the voltage supply to the resistance network.
Set the voltage supply to
15V
3.
Measure the voltages V1, V2, V3, and VS and the current IS
4.
Opencircuit the resistor R3 and measure the voltage V3 and the current Is.
5.
Short circuit the resistor R3 and measure the voltage V3 and the current Is.
Resistors in Parallel
1.
Connect the three resistors of Figure 2 together in parallel and measure the
equivalent resistance before the voltage source is connected to the circuit.
2.
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This note was uploaded on 04/15/2008 for the course EE EE 300 taught by Professor Davoux during the Spring '08 term at SD State.
 Spring '08
 davoux

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