1. Lecture 61 EEE 302 Electrical Networks II Dr. Keith E. Holbert Summer 2001

2. Lecture 62 Maximum Average Power Transfer To obtain the maximum average power transfer to a load, the load impedance (Z L ) should be chosen equal to the complex conjugate of the Thevenin equivalent impedance representing the remainder of the network Z L = R L + j XL = R Th - j X Th = Z Th *

3. Lecture 63 Maximum Average Power Transfer V oc + - Z Th ZLZL Z L = Z Th * Note that ONLY the resistive component of the load dissipates power

4. Lecture 64 Max Power Xfer: Cases

5. Lecture 65 Class Examples Extension Exercise E9.5 Extension Exercise E9.6

6. Lecture 66 Effective or RMS Values Root-mean-square value (formula reads like the name: rms) For a sinusoid:I rms = I M /  2 –For example, AC household outlets are 120 Volts-rms

7. Lecture 67 Why RMS Values? The effective/rms current allows us to write average power expressions like those used in dc circuits (i.e., P=I²R), and that relation is really the basis for defining the rms value The average power (P) is

8. Lecture 68 Class Examples Extension Exercise E9.7 Extension Exercise E9.9 Extension Exercise E9.10