CH07 - AC Power

CH07 - AC Power - G Rizzoni Principles and Applications of...

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G. Rizzoni, Principles and Applications of Electrical Engineering Problem solutions, Chapter 7 7.1 Chapter 7 Instructor Notes Chapter 7 surveys all important aspects of electric power. Coverage of Chapter 7 can take place immediately following Chapter 4, or as part of a later course on energy systems or electric machines. The material in this chapter will be of particular importance to Aerospace, Civil, Industrial, and Mechanical engineers, who are concerned with the utilization of electric power. The chapter permits very flexible coverage, with sections 7.1 and 7.2 describing basic single-phase AC power ideas. A survey course might only use this introductory material. The next two sections discuss transformers and three-phase power. Two descriptive sections are also provided to introduce the ideas of residential wiring, grounding and safety, and the generation and distribution of AC power. These sections can be covered independent of the transformer and three-phase material. The section Focus on Measurements: The wattmeter provides a practical look at the measurement of power. The section Focus on Measurements: How Hall-effect current transducers work may be useful in the context of a power systems course, while Focus on Measurements: Power factor correction proposes a more applied look at the problem of improving the power factor of an industrial load. The homework problems present a few simple applications in addition to the usual exercises meant to reinforce the understanding of the fundamentals. Problems 7.19, 20, 22-25 present a variety of power factor correction problems. Two advanced problems (7.35, 7.36) discuss transformer test methods; these problems may be suitable in a second course in energy systems. Problem 7.48 illustrates the billing penalties incurred when electric loads have insufficient power factors (this problem is based on actual data supplied by Detroit Edison). Those instructors who plan to integrate the three-phase material into a course on power systems and electric machines, will find that problems 7.47 and 7.49-51 can be assigned in conjunction with the material covered in Chapter 17, as part of a more in-depth look at three-phase machines.
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G. Rizzoni, Principles and Applications of Electrical Engineering Problem solutions, Chapter 7 7.2 Problem 7.1 Solution: Known quantities: Resistance value, 30 = R , and the voltage across the soldering iron, V 117 = V ~ . Find: The power dissipated in the soldering iron. Analysis: The power dissipated in the soldering iron is: W 3 456 30 117 2 2 . R V ~ P = = = ______________________________________________________________________________________ Problem 7.2 Solution: Known quantities: Rated power, W 1000 = P , and the voltage across the heating element, V 240 = V ~ . Find: The resistance of the heating element. Analysis: The power dissipated in the electric heater is: 6 57 1000 240 2 2 . P V ~ R = = = ______________________________________________________________________________________ Problem 7.3 Solution: Known quantities: Resistance value, 50 = R of the resistor.
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