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McMaster University 1EL3
Lab 6
Thevenin’s Theorem Introduction
The purpose in this experiment is to study the Thevenin theorem. The theorem works by making complicated circuits easier to work with. By only leaving one source in the circuit and one resistor. Then calculating Rth and Eth across the load point we need.
McMaster University 1EL3
Results
Part 1: Colours
Expected
Resistance
Measured
Resistance
R1
Brown, Red, Red
1.2 kΩ
1.194 kΩ
R2
Red, Yellow, Red
2.4 kΩ
2.38 kΩ
R3
Brown, Blue, Red
1.6kΩ
1.597 kΩ
R
L
Yellow, Violet,
Brown
0.470 kΩ
0.468k Ω
Step 3, 4, and 5
Calculated
Measured
%Error
McMaster University 1EL3
Thevenin Voltage
6V
6.14 V
2.3%
Thevenin Resistance
2.4 k
Ω
2.38 k
Ω
0.71%
Step 2 & 6
Original
Circuit
Thevenin’s Equivalent
circuit
Measured Load
Voltage
1.006V
1.033V
Measured Load
Current
2.14 mA
2.14 mA
MultiSim Circuit
Calculations -
To calculate Thevenin voltage in step 3-5: replace where the resistor 470 ohms which is the load by an open circuit and measure V. V load = VR2= 6v
-
To calculate Thevenin resistance in step 3-5: replace voltage sources by short circuit and current sources by open circuit. Measure resistance at the load.
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