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Curtin University of Technology Engineering Foundation Year Electrical Systems 100 Assignment Due date: 19 September, 2011 4:00 pm Students should hand in their assignment with cover sheet to the assignments office (204-Level 2) on or before the due date Problem #1 Figure 1 The variable resistor Zo in the circuit shown in Fig. 1 is adjusted until maximum average power is delivered to Zo. a) Find the value of Zo b) Calculate the maximum average power delivered to Zo c) What percentage of the total average power developed in the circuit is delivered to Zo d) Calculate the active and reactive power associated with all elements in the circuit including the dependent current source
Problem #2 Figure 2 The sinusoidal voltage source in the circuit shown in Fig. 2 is developing an rms voltage of 2000 V. The 4 O load in the circuit is absorbing four times as much average power as the 25 O load. The two loads are matched to the sinusoidal source that has an internal impedance of 500 O. a) Specify the numerical values of a1 and a2. b) Calculate the values of I1, I2 and I3 c) Calculate the power delivered to the 25 O and the 4 O resistors. d) Calculate the rms value of the voltage across the 25 O and the 4 O resistors. End of Assignment