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
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
Resistors (Select any three resistors and calculate their Thevenin equivalent resistance)
DC Power Supplies
VS R2 VTH RTH
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:
3. Write down the expression for the open terminal voltage Vab which is equal to 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?
5. Write the expression for the power delivered to RL:
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?
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:
Vs VL1 I L1 PL1 I L1 V L1
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:
Vs VTH VL2 I L2 PL 2 I L 2 VL 2
8. Your measurements should show the following equalities:
VL1 = VL2 IL1 = IL2 PL1 = PL2
1. If VTH aVS ; calculate the average value of a
2. Write the expression for a in terms of R1, R2 and R3
3. If we set VS = 200V in circuit 1, what will be the value of VTH?
4. What should be the value of VS in circuit 1 to have VTH = -25V?
5. If we replace R1 with a short circuit, what will be the value of a?
6. If we replace R2 with a short circuit, what will be the value of 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 =