EET-117-Lab 8- Series Parallel Circuit_23W
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School Of Engineering Technology and Applied Science (SETAS)
Advanced Manufacturing and Automation Technology (AMAT)
EET 117 – Lab Instructions
Section: __________________
Date: Lab #8
GROUP: ___________________
Series-Parallel Circuits Based on Experiments in Basic Circuits by David Buchla
Name: ______________________________
Name:______________________________
Status and Signature : Objectives: 1. Use the concept of equivalent circuits to simplify series-parallel circuit analysis.
2. Compute the currents and voltages in a series-parallel combination circuit and verify your computation with circuit measurements.
Required Instruments and Components:
Power supply
DMM (Digital Multimeter)
Breadboard
Alligator test leads (from the EET-117 lab kit)
Resistors: 1 kΩ, 4.7 kΩ, 5.6 kΩ, 10.0 kΩ (from the EET-117 lab kit)
Procedure
1.
Obtain the resistors listed in Table 1. Measure each resistor and record the measured value in the table. A reminder of steps to measure resistance using lab DMM (a reference to the
manual):
1. Connect the device under test to the instrument, as shown:
2. Select a resistance measurement function:
• Press 2 to select 2-wire ohms.
Ω
Table 1. Measured resistance values (use 3 significant digits, metric prefixes).
Component
Listed Value
Measured Value
Marks
R
1
1 kΩ
/1
R
2
4.7 kΩ
/1
R
3
5.6 kΩ
/1
R
4
10.0 kΩ
/1
Total:
/4 2.
Connect the circuit shown in Figure 1. Notice that the identical current is through R
1
, and R
4
so we know that they are in series. R
2
has both ends connected directly to R
3
so these resistors are in parallel.
Fig. 1
3.
You can begin solving for the currents and voltages in the circuit by replacing resistors that are either in series or in parallel with an equivalent resistor. In this case, begin by replacing R
2
and R
3
with one equivalent resistor. Label the equivalent resistor R
23
. Draw the equivalent series circuit in
the space provided below. Show the value of all components, including R
23.
Marks: / 10
4.
The equivalent circuit you drew above (in step 3) is a series circuit. To calculate currents and voltages in the original circuit you can apply the following steps:
a)
Find the total current, I
T
, in the circuit by substituting the total voltage and the total
resistance into Ohm's law. Enter the computed total current. b)
In the equivalent series circuit, the total current is flowing through R
1
, R
23
, and R
4
. c)
The voltage drop across each of these resistors can be found by applying Ohm's law to each
resistor. Compute V
1
, V
23
, and V
4
using this method. d)
Use V
23
and Ohm's law to compute currents in R
2
and R
3
(I
2
and I
3
) of the original circuit. As
a check, verify that the computed sum of I
2
and I
3
is equal to the computed total current.
Compute the total resistance R
T and show calculations: Compute the total current I
T
and show calculations:
Compute voltages
on different parts of this equivalent circuit (
V
1
, V
23
,
V
4
) and show calculations:
Compute currents
I
2
and I
3
and show calculations:
Enter calculated above results in Table 2.
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5.
Measure, enter, and compare values in the column beside (Measured in Table 2). Important
reminder: don’t forget to disconnect the power supply when measuring the total resistance.
When measuring current always connect the ammeter in series and select appropriate
function (DCI) with associated connections on DMM (GND & I). Table 2. Measured and computed values (use 3 significant digits, metric prefixes).
Computed (Ohm’s Law)
Measured
Marks
V
s
12.0 V
/2
R
T
/4
I
T
/4
V
1
/4
V
23
/4
V
4
/4
I
2
/2
I
3
/2
Total:
/26
6.
The voltage divider rule can be applied directly to the equivalent series circuit to find the voltages
across R
1
, R
23
, and R
4
. Find V
1
, V 23
, and V
4
using the voltage divider rule. Tabulate the results in
Table 2 and place the results in Table 3. Table 3. Computed values (use 3 significant digits, metric prefixes).
COMPUTED (Voltage Divider Formula: show formula and calculations) Marks
V
1
/2
V
23
/2
V
4
/2
Total:
/6
7.
The current divider rule can be applied to the parallel circuit to find the current in its branches
(e.g. I
2 and I
3
). Tabulate the results from Table 2 and place results in Table 4 showing formulas and
calculations. Table 4. Computed values (use 3 significant digits, metric prefixes).
COMPUTED (Current Divider Formula: show formula and calculations) Marks
I
2
/2
I
3
/2
Total:
/4
8.
Change the circuit to the circuit shown in Figure 2. Draw an equivalent circuit by combining the
resistors that are in series. Enter the values of the equivalent resistors on your schematic drawing
and in Table 5.
Fig. 2
Marks: / 10
Table 5. Measured and computed values (use 3 significant digits, metric prefixes).
Computed
Measured
Marks
R
12
/4
R
34
/4
R
T
/4
I
T
/4
I
12
/4
I
34
/4
V
1
/4
V
2
/4
V
3
/4
V
4
/4
Total:
/40
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Conclusions. The conclusion summarizes the important points of the laboratory work. You must
analyze the examples to add emphasis to significant points. You must also include features and/or
things you have done /benefits of a particular procedure, instrument, component, or circuit directly
related to the experiment
.
Marks: / 20
Rubric-Grading
Criteria
Max.
Marks
Punctuality
10
Lab Safety
20
Procedure
100
Conclusion
20
Neatness, Spelling, Grammar, and Sentence Structure
10
Total:
/160