Verification of Thevenin's Theorem

Procedure

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Keep all the resistances (R1, R2, R3, RL) close to their respective maximum values. Choose any arbitrary values of V1 and V2.

Experiment Part Select

Case 1: In the presence of both sources with load

Select switch S1 to Power and S2 to Load and Simulate the program from Case 1 tab. Observe the load current (IL) and load voltage (VL).

Case 2(a): Thevenin Voltage Analysis

Select switch S1 to Power and S2 to Intermediate and Simulate the program from Case 2(a) tab. Read the Thevenin voltage (Vth).

Case 2(b): Thevenin Resistance Analysis

Select switch S1 to Short and S2 to Power and Simulate the program from Case 2(b) tab. Read the Thevenin resistance (Rth).

Case 3: Load Current using Vth and Rth

Ensure Vth and Rth are calculated, then select switch S1 to Power and S2 to Load and Simulate the program from Case 3 tab. Compare the load current (IL) with Case 1.

MC: Moving Coil.

DPDT: Double Pole Double Throw.

N.B.: All the resistors are in ohms.

Inputs & Switches

V
V
Ω
Ω
Ω
Ω

Circuit Diagram

circuit diagram V1: 110 V V2: 220 V R1: 102 Ω R2: 300 Ω R3: 200 Ω RL: 500 Ω

Meters

Meter A1: IL
0 A 1.25 A 2.5 A 3.75 A 5 A A1
Meter MC: Voltage
0 V 125 V 250 V MC
Case 1
Case 2(a)
Case 2(b)
Case 3

Circuit Analysis to Determine Load Current (IL)

Load Current (IL): 0 A

Load Voltage (VL): 0 V

Thevenin Voltage (Vth): 0 V

Thevenin Resistance (Rth): 0 Ω

Short-Circuit Current (Isc): 0 A

Select switch S1 to Power and S2 to Load.

All voltages are in Volts, currents in Amps, resistances in Ohms

Observation Table

SI. no. Case 1
Load Current and Voltage		 Case 2(a)
Thevenin Voltage		 Case 2(b)
Thevenin Resistance		 Case 3
Load Current
IL (A) VL (V) Vth (V) V2 (V) Isc (A) Rth (Ω) IL (A)
1
2
3
4