Download File - Solayman EWU

EAST WEST UNIVERSITY
Course Name
: Electric Circuits - I
Course Code
: EEE 101 LAB
Section No
: 02
Group No
: 06
Experiment No
: 06
Name of the Experiment : Verification of Thevenin’s theorem
Date of allocation
: 24/03/2013
Date of submission
: 31/03/2013
Submitted To
:
Mariam B. Salim
Student’s ID
: 2013-1-80-022
Student’s Name
: Md. Solayman Khan
Objective:
The objective of this exmeriment was to verify the Thevenin’s
theorem by applying the principle to a practical electric circuit.SPICE simulation is
also going to be used to verify this principle.
Circuit diagrams:
Figure 1(a) :Diagram of the circuit whose Thevenin’s equivalent circuit was
determined (without simulated results):
Figure 2(a) :Diagram for measuring the open circuit voltage (without simulated
results):
Figure 3(a) :Diagram for measuring the short circuit current (without simulated
results):
Figure 4(a) :Circuit diagram for verifying the thevenin’s theorem (without
simulated results):
Answer to the que no 1 :
Experimental datasheet is attatched at the last of the post-lab report.
Answer to the que no 2 :
Comparison of VL and IL between figure 1 and figure 4 according to experiment data
:
Type
Figure 1
Figure 4
VL(v)
3.25
3.26
IL (mA)
3.289
3.3
Answer to the que no 3 :
All four simulated circuits are attatched after this page.
According to simulated results,
From figure 1,
VL=3.249v
IL=3.288mA
From figure 2,
VOC=7.076v
From figure 3,
ISC=6.08mA
From figure 4,
VL=3.266v
IL=3.305mA
Discrepancy between the values of figure 1 and figure 4:
Discrepancy of VL: (⃒(3.249 - (3.266)) / 3.249 ⃒) ×100%=0.523%<10%
Discrepancy of IL: (⃒(3.288-(3.305))/ 3.288 ⃒) ×100%= 0.517%<10%
As,the discrepancy is less than 10% ,So,it can be said that,Theveni’s theorem is
verified with my simulated data.
Figure 1(b) :Diagram of the circuit whose Thevenin’s equivalent circuit was
determined (with simulated results) :
Figure 2(b) :Diagram for measuring the open circuit voltage (with simulated
results):
Figure 3(b) :Diagram for measuring the short circuit current (with simulated results):
Figure 4(b) :Circuit diagram for verifying the thevenin’s theorem (with simulated
results):
Answer to the que no 4 :
Comparison among measured , Calculated and simulated values :
Resistors:
Type
Measured
Calculated
Simulated
R1 (kΩ)
1.001
1
1.001
R2 (kΩ)
3.29
3.3
3.29
R3 (kΩ)
4.6
4.7
4.6
R4 (kΩ)
0.979
1
0.979
RL (kΩ)
0.988
1
0.988
RTh (kΩ)
1.16
1.18
1.16
Voltage sources:
Type
Calculated
Measured
Simulated
V1(v)
10
10
10
V2(v)
5
5
5
Voltages:
Type
Calculated
Measured
Simulated
VL(v) Fig.1
3.26
3.25
3.249
VOC(v)
7.09
7.1
7.076
VTh(v)
7.09
7.1
7.1
VL(v) Fig.4
3.252
3.26
3.266
Currents:
Type
Calculated
Measured
Simulated
IL(mA) Fig.1
3.26
3.289
3.288
ISC(mA)
6.034
6.1
6.08
IL(mA) Fig.4
3.252
3.3
3.305
Comment : From the comparison among measured , Calculated and
simulated values,we can see that there is almost no discrepancies among
those values. And the discrepancy that we got was for the discrepancy of the
values of resistences.
Conclution : In this experiment, we verified Thevenin’s theorem in both lab
and PSPICE. Now we can convert two terminal linear circuits into a voltage
source in series with a resistence as well as Thevenin’s equivallent circuit.