ELEC 152 - Circuit Theory I Module 7 Lab: Maximum Power Transfer Theorem.
The purpose of this lab is to explore the application of the Thevenin Equivalent model to the Maximum
Power Transfer Theorem. 1. Thevenin and Norton Equivalent Circuits
1.1 Consider the circuit shown in Figure 1. Figure 1: Circuit for Thevenin and Norton Equivalents 1.2 Analyze the circuit from Figure 1 and calculate the values of its Thevenin model and complete the table
below: Thevenin Model
Vth
Rth ELEC 152 – Module 7 Laboratory - Page 1 1.3 Analyze the circuit again, this time calculating the values of its Norton model and complete the table below: Norton Model
IN
RN 1.4 Verify the equivalency between the parameters of both models.
1.5 Using Multisim, Measure Vth, Rth and I N. Make sure that you show the experimental setup for each
parameter in your lab report. Complete the table below. Thevenin Model
Vth
Rth (or R N)
IN 1.6 Compare the calculated with the measured values. Explain any differences. ELEC 152 – Module 7 Laboratory - Page 2 2. Maximum Power Transfer
2.1 In order to evaluate the power transferred to a load, we will connect a variable resistor (or a potentiometer)
to terminals A-B. We will then vary the value of the load while we measure the power transferred to the load.
We will start by connecting a 500 Ω potentiometer to the terminals A-B: Figure 2 shows the location of
potentiometers in Multisim (Basic Potentiometer Value). Note that if Multisim does not contain the value
of the potentiometer that you need for your experiment, you can change its value by double clicking on the
device. Figure 2: Location of potentiometer ELEC 152 – Module 7 Laboratory - Page 3 2.2 Connect the potentiometer to the terminals A-B as shown in Figure 3. Figure 3: Connection of potentiometer By default, potentiometers in Multisim are placed with 50% of their nominal value. This means, in this case, that
the value of this potentiometer is 250 Ω. The value of the potentiometer can be changed by typing the Key
associated with the potentiometer, in this case A. Typing A (capital A) increases the value of its resistance, while
typing a (lowercase a) decreases it. This allows the user to easily change the value between 0 and its nominal
resistance (500 Ω in this example).
2.3 Measure the power transferred to the load when the value of the potentiometer is 50%. You can use the
Wattmeter described in Lab 6, or you can measure voltage and current and multiply both values. At this point,
you should be able to set up the instruments on your own.
Power (50% or 250 Ω) = 2.4 We will now vary the value of the potentiometer between 0% and 100%. Complete the table below by
calculating the value of the resistance in each case and measuring the power transferred to the load.
% pot 0% 10% 20 % 30 % 40 % 50% 60% R
Power ELEC 152 – Module 7 Laboratory - Page 4 70 % 100% 2.5 What is the value of the potentiometer that results in the maximum transfer of power? How does this value
relate to the Thevenin resistance of the circuit? 3. Laboratory Report
Create a laboratory report using Word or another word processing software that contains at least these
elements:
- Introduction: What is the purpose of this laboratory experiment?
- Results for each section: Measured and calculated values, calculations, etc., following the outline.
Include screenshots for the circuits and waveforms as necessary -- You can press Alt + Print_Screen
inside Multisim or if using Windows 7, you can use the “Snipping tool.” Either way, you can paste these
figures into your Word processor. Also include here the charts and graphs that you have created with
the data you have collected.
- Conclusion: What area(s) you had difficulties with in the lab; what you learned in this experiment; how
it applies to your coursework and any other comments. ELEC 152 – Module 7 Laboratory - Page 5

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