Basic Electrical Engineering

1. Maharashtra Institute of Technology,
Aurangabad
LABORATORY MANUAL
Practical Experiment Instruction Sheet
EXPERIMENT TITLE :Verification of Thevenin's Theorem.
EXPERIMENT NO.10 : MIT(T)/ETC/Basic Electrical Engineering /Manual No.1
FY(All) DEPARTMENT: Electronics & Telecommunication Engineering
LABORATORY : Basic Electrical Engineering Location Part I Page 47
Aim: Verification of Thevenin's Theorem.
Apparatus: 1.Trainer kit 2.Digital multimeter 3. patch chord etc.
Theory:
Thevenin’s Theorem as applied to d.c. circuit may be stated as under:
The current flowing through a load resistance RL connected across any two terminals A and B often
active network is given by IL = Vth / (Rth + RL ), where Vth is the open circuit voltage (i.e. voltage
between the two terminal (A&B) When RL is removed and Rth the internal resistance of the network as
viewed back into the open circuited network from terminal A and B with all voltage sources are
replaced by their internal resistance (if any) and current sources by infinite resistance.
Prepared By: Mr. S.S. Chate Approved By: Dr. G.S. Sable

2. Maharashtra Institute of Technology,
Aurangabad
LABORATORY MANUAL
Practical Experiment Instruction Sheet
EXPERIMENT TITLE :Verification of Thevenin's Theorem.
EXPERIMENT NO.10 : MIT(T)/ETC/Basic Electrical Engineering /Manual No.1
FY(All) DEPARTMENT: Electronics & Telecommunication Engineering
LABORATORY : Basic Electrical Engineering Location Part I Page 48
Connection diagram
Component values: R1 = R2 = R3 = R4 = 100 ohms.
Procedure:
1. Switch ON the trainer kit by connecting to main.
2. Connect the voltmeter provided in kit across V1 and adjust V1.
3. Connect AB and GH and Ammeter as shown in circuit diagram (Presently don’t connect R4 in the
circuit.
4. Adjust load current ‘IL’ by adjust RL.
5. Now, to calculate this load current using thevenin’s theorem, remove the current meter jumper links
(i.e. RL will be removed).
6. Now measure the open circuit voltage between E & K i.e. Vth.
7. Now disconnect the jumper links of V1 (i.e. AB &GH) and short the resistances by connecting B &
H by patch chord.
Prepared By: Mr. S.S. Chate Approved By: Dr. G.S. Sable

3. Maharashtra Institute of Technology,
Aurangabad
LABORATORY MANUAL
Practical Experiment Instruction Sheet
EXPERIMENT TITLE :Verification of Thevenin's Theorem.
EXPERIMENT NO.10 : MIT(T)/ETC/Basic Electrical Engineering /Manual No.1
FY(All) DEPARTMENT: Electronics & Telecommunication Engineering
LABORATORY : Basic Electrical Engineering Location Part I Page 49
8. Measure equivalent resistance at the point RL removed (between E & K) i.e. Rth and calculate the
load current with thevenin’s theorem using equation.
IL (Calculated) = Vth / (Rth + RL). Compared the IL measured and IL Calculated.
9. Repeat the experiment with R4 connected in circuit.
Observation Table:
Sr.
No.
Input
Voltage
V1
Load current IL
(mA) Observed
Vth
(Volt)
Rth Ohm. RL Load
resistance
ohm.
IL Calculated =
Vth / (Rth + RL)
Sample calculation: IL = Vth / (Rth + RL)
Conclusion: As IL (measured) = IL Calculated (by Thevenin’s theorem) which verify the Thevenin’s
theorem. The small difference between the two is due to meter errors, observation error and error due
to neglecting the internal resistance of the source.
Prepared By: Mr. S.S. Chate Approved By: Dr. G.S. Sable