1. EE 1270 Introduction to Electric Circuits Suketu Naik 0 EE 1270: Introduction to Electric Circuits Lecture 11: Maximum Power Transfer Chapter 4 Techniques of Circuit Analysis: Sections 4.12

2. EE 1270 Introduction to Electric Circuits Suketu Naik 1 Maximum Power Transfer  In many practical situations, a circuit is designed to provide power to a load, e.g. communications where it is desirable to maximize the power delivered to a load such as transmitter to antenna, audio amplifier to speaker  The Thevenin equivalent is useful in finding the maximum power a linear circuit can deliver to a load

3. EE 1270 Introduction to Electric Circuits Suketu Naik 2 Maximum Power Transfer Maximum power is transferred to the load when the load resistance equals the Thevenin resistance (R L =R TH ). Only if R L =R TH i increases V L decreases i decreases V L increases

4. EE 1270 Introduction to Electric Circuits Suketu Naik 3 Example 4.12 a) Find R L that results in max power transfer b) Find the max power, P max c) Find the % of P 360V is delievered to R L Q: What happens if R L =1 MΩ?

5. EE 1270 Introduction to Electric Circuits Suketu Naik 4 AP 4.21 a) Find R that results in max power transfer b) Find max power delievered to R

6. EE 1270 Introduction to Electric Circuits Suketu Naik 5 AP 4.22 a)Assume max power transfer (use R found in AP 4.21) What is P 100 V ? b)What is P Vφ ? c) What percentage of the two powers is delivered to R?