Download PRACTICAL # 08

Maximum Power Transfer Theorem.
By: Engr.Irshad Rahim Memon

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.

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”.

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.
 Multism
Software
 Resistors
 Bread board
 Multimeter
 DC voltage source
 Connecting wire etc
 Realize
the circuit on breadboard as shown in
figure 02.
 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
 Second
Case RL=Rs
 Third
Case RL>Rs
 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.