Maximum Power Transfer Theorem. By: Engr.Irshad Rahim Memon PRACTICAL # 08 Maximum Power Transfer Theorem. By: Engr.Irshad Rahim Memon

OBJECTIVE Objective of this practical is to learn about maximum power transfer theorem; and verify that how and when maximum power is transferred to a load.

What is Maximum Power Transfer Theorem? Maximum power transfer theorem states that “For a given source voltage, maximum power is transferred from a source to a load when the load resistance is equal to the internal resistance of source”.

Considering Figure Below for Theorem In the figure 01 a voltage source Vs with its internal resistance Rs is connected with load resistor RL in series. According to maximum power transfer theorem, when Rs=RL, maximum power will be transferred to RL.

Formula to Find Power & Current of Fig01 Circuit

Coming Towards Objective Now

REQUIRED APPARATUS Multism Software Resistors Bread board Multimeter DC voltage source Connecting wire etc

PROCEDURE Realize the circuit on breadboard as shown in figure 02.

PROCEDURE CONTINUED…. Here value of RL is variable. For the verification of maximum power transfer theorem, value of RL should be set such that (i) RL<Rs (ii) RL=Rs (iii) RL>Rs, then find out power dissipation at RL in all three cases.

First Case RL<Rs

First Case RL<Rs Continued…

Second Case RL=Rs

Third Case RL>Rs

Third Case RL>Rs Continued

Prove All Results Above Manually

ANOTHER EXAMPLE First Case RL<RS

ANOTHER EXAMPLE Second Case RL=Rs

ANOTHER EXAMPLE Third Case RL>Rs

Observation:- For different values of RL, various values of PL are obtained. The maximum power is dissipated at RL only when RL=Rs as shown in table 01 and figure 03.

Table 01 & Fig03

ANY QUERY?