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ENA-LAB 7 - Lab manual
ELECTRICAL NETWORK ANALYSIS - ENA (National University of Computer and
Emerging Sciences)
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Electrical Network Analysis
EL-228
Laboratory Manual
Fall 2017
Lab # 7
Maximum Power Transfer Theorem
Engr. Khalid Usman
Name: ______________ Roll #: _____________ Sec: ______
Name: ______________ Roll #: _____________ Sec:______
Date of Performed: _______________
Marks Awarded: _____/10
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NATIONAL UNIVERSITY OF COMPUTER AND EMERGING SCIENCES, ISLAMABAD
Prepared by: Engr. Khalid Usman, Engr. Sana Saleh
Last Edited by: Engr. Khalid Usman
Verified by: Dr. Durdana Habib
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Maximum Power Transfer Theorem LAB 07
Lab # 07: Maximum Power Transfer Theorem
Learning Objective:
To verify the Maximum Power Transfer Theorem.
Effect of different loads for Maximum Power Transfer.
Equipment Required:
Digital multi-meter
Oscilloscope
Function Generator
Breadboard
Probes [3]
Resistors (1.5KΩ,2.2KΩ)
Capacitor (100nF)
Inductor
Theory:
In the DC case, maximum power transfer is achieved by setting the load resistance equal to the
source’s internal resistance. This is not true for the AC case. Instead, the load should be set to
complex conjugate of the source impedance, the complex conjugate having the same magnitude
as the original but with the opposite sign for the angle. By using the complex conjugate, the
load and source reactive components will cancel out leaving a purely resistive circuit similar
to the DC case. When calculating the true load power, care must be taken to remember that the
load voltage appears across complex load impedance. Only the real portion of this voltage
appears across the resistive component, and only the resistive component dissipates power.
Circuit Diagram:
Fig 7.1. Circuit connection
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Maximum Power Transfer Theorem LAB 07
Theoretical Calculation:
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Maximum Power Transfer Theorem LAB 07
Procedure:
1. Build the circuit of Figure 7.1.
2. Replace the generator with a 50 resistor and determine Thevenin impedance at 10
kHz of the circuit. Record this value in Table 1, including both magnitude and phase.
3. Determine the VTH experimentally and theoretically and notes these values in table 1.
4. Determine the load impedance which should achieve maximum power transfer
according to the theorem and record in Table 1.
5. Finally, determine values for RL and CL or LL to achieve the load impedance and
record in Table 1.
6. Choose two different values of RL and LL or CL higher than the value in step 4.Note
the value in Table 2.
7. Choose two Different values of RL and LL or CL lower than the value in step 4.Note
the value in Table 3.
Table 1 for ZTH=ZL:
Calculated Values Measured Values
VTH RTH XTH RL X VL PL VTH RTH XTH RL X VL PL
Table 2 for ZL > ZTH:
Calculated Values Measured Values
VTH RTH XTH RL X VL PL VTH RTH XTH RL X VL PL
Table 3 for ZL < ZTH:
Calculated Values Measured Values
VTH RTH XTH RL X VL PL VTH RTH XTH RL X VL PL
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Maximum Power Transfer Theorem LAB 07
POST LAB:
1. Will achieving maximum load power also achieve maximum efficiency? Explain
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Submission Declaration by the Student:
In submitting this lab write-up to the Lab Engineer/Instructor, I hereby declare that:
I have performed all the practical work myself
I have noted down actual measurements in this write up from my own working
I have written un-plagiarized answers to various questions
I have/have not obtained the desired objectives of the lab.
Reasons of not obtaining objectives (if applicable): _________________________________
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Student’s signature and Date
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