# Verify Thevenin’s Theorem by ChintooG

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Verify Thevenin’s Theorem.....in Lab work....

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```									                 The Islamia University of Bahawalpur
University College of Engineering & Technology
Department of Electrical Engineering
EE211 Network Analysis 3rd Term (2nd Year)

(LAB EXPERIMENT NO. 2)

Name: _______________________________ Roll No. __________________

Signature: ____________________________ Date: ____________________

To Verify Thevenin’s Theorem

Performance Objectives:

Upon successful completion of this experiment student will be able to:
 Understand the concept of source transformation
 Implement Thevenin’s theorem on complicated circuits to simplify them

Equipment Required:

   Resistors (Select any three resistors and calculate their Thevenin equivalent resistance)
   DC Power Supplies
   Digital Multimeter
R1             R3
a
+

VS                       R2            VTH RTH
-
b
Figure 1

RTH
c

VTH

d

Figure 2

Prior Calculations:
Consider the circuits in figure 1 and figure 2 and follow the steps given below:
1. Write down the values of the three resistors you have selected for figure 1:
R1 =                   R2 =                   R3 =
2. Calculate the value of RTH which will be used in circuit of figure 2:
RTH =
3. Write down the expression for the open terminal voltage Vab which is equal to VTH:
VTH =
4. If a load resistor (RL1) of 1kΩ is inserted between terminals a and b, what will be the
expression for the load current IL1?
IL1 =
5. Write the expression for the power delivered to RL:
PL1 =
6. If a load resistor (RL2) of 1kΩ is connected between terminals c and d in figure 2, what will
be the expression for current through this resistor?
IL2 =
Procedure:
1. Connect the circuit given in figure 1
2. Insert a load resistor of 1kΩ between terminals a and b
3. By adjusting the value of Vs, measure VL1 and complete the table given below:

V L1
Vs           VL1        I L1           PL1  I L1  V L1
1k
0
2
4
6
8
10
12
14
16

Table 1

4. Now on the same board connect the circuit given in figure 2
5. Insert a load resistor of 1kΩ between terminals c and d
6. For each value of VS in table 1, calculate the value of VTH and complete the second column
of table 2 given below
7. By adjusting the value of VTH, measure VL2 and complete the table 2:
VL2
Vs          VTH                VL2       I L2          PL 2  I L 2  VL 2
1k
0
2
4
6
8
10
12
14
16

Table 2

8. Your measurements should show the following equalities:
VL1 = VL2               IL1 = IL2                PL1 = PL2

Questions:
1. If VTH  aVS ; calculate the average value of a

VTH
a       
VS
2. Write the expression for a in terms of R1, R2 and R3
a
3. If we set VS = 200V in circuit 1, what will be the value of VTH?
VTH =
4. What should be the value of VS in circuit 1 to have VTH = -25V?
VS =
5. If we replace R1 with a short circuit, what will be the value of a?
a=
6. If we replace R2 with a short circuit, what will be the value of a?
a=
7. What is possible maximum value of a?
8. What is possible minimum value of a?
9. If we replace R3 with a short circuit in figure 1, will power delivered to load resistor
increase or decrease?
10. Convert the circuit in figure 2 to a Norton equivalent if VTH = 10V and RTH = 4kΩ
IN =                             RN =

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