EE214 - Maximum Power Transfer Theorem

EE214

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Title: Maximum Power Transfer

Aim: To connect and test simple DC and AC circuits. To operate the AVO meter on DC and AC voltage and current ranges. To verify the maximum power transfer theorem for DC and AC Circuits.

Apparatus:  See your manual for apparatus.

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THEORY:

          The power transferred from a supply source to a load is at its maximum when the resistance of the load is equal to the internal resistance of the source. On the other words" A resistive load will be consumptive maximum power from the supply when the load resister is equal to the equivalent (Thevenin) network resister"

          Maximum power transfer theorem determines the value of resistance RL for which, the maximum power will be transferred from source to it. Actually the maximum power, drawn from the source, depends upon the value of the load resistance. There may be some confusion let us clear it.

R_L = R_th …….

For maximum power transfer

I_L = V_th / (R_th + R_L) = V_th / (R_th + R_th) = V_th / 2R_th

Where, P_max = I_L 2R_L = V_th 2 / 4R_th

 The maximum value of power which occurs when

R_L = R_th.

            Maximum power transfer does not coincide with maximum efficiency.     

            Application of The Maximum Power Transfer theorem to AC power distribution will not result in maximum or even high efficiency. The goal of high efficiency is more important for AC power distribution, which dictates a relatively low generator impedance compared to load impedance.

Similar to AC power distribution, high fidelity audio amplifiers are designed for a relatively low output impedance and a relatively high speaker load impedance. As a ratio, "output impdance" : "load impedance" is known as damping factor, typically in the range of 100 to 1000. [rar] [dfd]

Maximum power transfer does not coincide with the goal of lowest noise. For example, the low-level radio frequency amplifier between the antenna and a radio receiver is often designed for lowest possible noise. This often requires a mismatch of the amplifier input impedance to the antenna as compared with that dictated by the maximum power transfer theorem. 

For Procedure and Circuit Diagram, See your Electrical Laboratory Manual on page 3. 

 Fill Up Tables in Your Manual and Continue To….

PRECAUTIONS:

For Precautions, See General Electrical Lab Precautions

Answers to Questions:

No Questions in this experiment.

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About Uniben Engineering

Stephen Djes is a passionate Graduate of Engineering from the University of Benin, and he is geared towards helping fellow engineering students in the great institution of UNIBEN to do better at academics.