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EEE 302 Electrical Networks II

EEE 302 Electrical Networks II. Dr. Keith E. Holbert Summer 2001. Maximum Average Power Transfer.

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EEE 302 Electrical Networks II

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  1. EEE 302Electrical Networks II Dr. Keith E. Holbert Summer 2001 Lecture 6

  2. Maximum Average Power Transfer • To obtain the maximum average power transfer to a load, the load impedance (ZL) should be chosen equal to the complex conjugate of the Thevenin equivalent impedance representing the remainder of the network ZL = RL + j XL = RTh - j XTh = ZTh* Lecture 6

  3. ZTh + Voc ZL - Maximum Average Power Transfer ZL = ZTh* • Note that ONLY the resistive component of the load dissipates power Lecture 6

  4. Max Power Xfer: Cases Lecture 6

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

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

  7. 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 Lecture 6

  8. Class Examples • Extension Exercise E9.7 • Extension Exercise E9.9 • Extension Exercise E9.10 Lecture 6

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