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Introduction to Electrical Engineering
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ELECTRICAL ENGINEERING
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Table 11 Electrical engineering disciplines Circuit analysis Electromagnetics Solid-state electronics Electric machines Electric power systems Digital logic circuits Computer systems Communication systems Electro-optics Instrumentation systems Control systems
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The typical curriculum of an undergraduate electrical engineering student includes the subjects listed in Table 11 Although the distinction between some of these subjects is not always clear-cut, the table is suf ciently representative to serve our purposes Figure 11 illustrates a possible interconnection between the disciplines of Table 11 The aim of this book is to introduce the non-electrical engineering student to those aspects of electrical engineering that are likely to be most relevant to his or her professional career Virtually all of the topics of Table 11 will be touched on in the book, with varying degrees of emphasis The following example illustrates the pervasive presence of electrical, electronic, and electromechanical devices and systems in a very common application: the automobile As you read through the example, it will be instructive to refer to Figure 11 and Table 11
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Mathematical foundations Network theory Logic theory System theory
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Physical foundations Electromagnetics Solid-state physics Optics
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Digital electronics
Computer systems
Control systems
Communication systems
Instrumentation systems
Figure 11 Electrical engineering disciplines
EXAMPLE 11 Electrical Systems in a Passenger Automobile
A familiar example illustrates how the seemingly disparate specialties of electrical engineering actually interact to permit the operation of a very familiar engineering system: the automobile Figure 12 presents a view of electrical engineering systems in a
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Introduction to Electrical Engineering
Body electronics Airbags Climate Security and keyless entry Auto belts Memory seat Memory mirror MUX
Vehicle control Antilock brake Traction Suspension Power steering 4-wheel steer Tire pressure
Power train Engine Transmission Charging Cruise Cooling fan Ignition 4-wheel drive
Instrumentation Analog dash Digital dash Navigation
Entertainment Cellular phone CD/DAT AM/FM radio Digital radio TV sound
Figure 12 Electrical engineering systems in the automobile
modern automobile Even in older vehicles, the electrical system in effect, an electric circuit plays a very important part in the overall operation An inductor coil generates a suf ciently high voltage to allow a spark to form across the spark plug gap, and to ignite the air and fuel mixture; the coil is supplied by a DC voltage provided by a lead-acid battery In addition to providing the energy for the ignition circuits, the battery also supplies power to many other electrical components, the most obvious of which are the lights, the windshield wipers, and the radio Electric power is carried from the battery to all of these components by means of a wire harness, which constitutes a rather elaborate electrical circuit In recent years, the conventional electrical ignition system has been supplanted by electronic ignition; that is, solid-state electronic devices called transistors have replaced the traditional breaker points The advantage of transistorized ignition systems over the conventional mechanical ones is their greater reliability, ease of control, and life span (mechanical breaker points are subject to wear) Other electrical engineering disciplines are fairly obvious in the automobile The on-board radio receives electromagnetic waves by means of the antenna, and decodes the communication signals to reproduce sounds and speech of remote origin; other common communication systems that exploit electromagnetics are CB radios and the ever more common cellular phones But this is not all! The battery is, in effect, a self-contained 12-VDC electric power system, providing the energy for all of the aforementioned functions In order for the battery to have a useful lifetime, a charging system, composed of an alternator and of power electronic devices, is present in every automobile The alternator is an electric machine, as are the motors that drive the power mirrors, power windows, power seats, and other convenience features found in luxury cars Incidentally, the loudspeakers are also electric machines!
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Introduction to Electrical Engineering
The list does not end here, though In fact, some of the more interesting applications of electrical engineering to the automobile have not been discussed yet Consider computer systems You are certainly aware that in the last two decades, environmental concerns related to exhaust emissions from automobiles have led to the introduction of sophisticated engine emission control systems The heart of such control systems is a type of computer called a microprocessor The microprocessor receives signals from devices (called sensors) that measure relevant variables such as the engine speed, the concentration of oxygen in the exhaust gases, the position of the throttle valve (ie, the driver s demand for engine power), and the amount of air aspirated by the engine and subsequently computes the optimal amount of fuel and the correct timing of the spark to result in the cleanest combustion possible under the circumstances The measurement of the aforementioned variables falls under the heading of instrumentation, and the interconnection between the sensors and the microprocessor is usually made up of digital circuits Finally, as the presence of computers on board becomes more pervasive in areas such as antilock braking, electronically controlled suspensions, four-wheel steering systems, and electronic cruise control communications among the various on-board computers will have to occur at faster and faster rates Some day in the not-so-distant future, these communications may occur over a ber optic network, and electro-optics will replace the conventional wire harness It should be noted that electro-optics is already present in some of the more advanced displays that are part of an automotive instrumentation system
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