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Do you wonder why ac is used at all Isn t it a lot more complicated than dc Well, ac may be more complicated in theory, but in practice it is a lot simpler to use when it is necessary to provide electricity to a large number of people Alternating current lends itself well to being transformed to lower or higher voltages, according to the needs of electrical apparatus It is not so easy to change dc voltages Electrochemical cells produce dc directly, but they are impractical for the needs of large populations Serving millions of consumers requires the immense power of falling or flowing water, the ocean tides, wind, fossil fuels, controlled nuclear reactions, or geothermal heat All of these energy sources can be used to drive turbines that turn ac generators.

The road to the modern wireless communications network was fraught with technical, bureaucratic, and social speed bumps In 1905, listeners in New York City, accustomed to the staccato beat of Morse code broadcasts spewing from their radios, were astounded to hear music and voice as Reginald Fessenden, a local radio commentator, broadcast the results of the annual New York City yacht races Listeners could hear the results immediately, instead of waiting for the late edition of the paper Public perception of the possibilities of radio suddenly began to grow At roughly the same time, the US military, recognizing the potentially strategic value of radio communications in the armed forces, helped to create the Radio Corporation of America (RCA), ushering wireless technology into the technological forefront The first wireless applications were developed in 1915 and 1916 for ship-to-ship and ship-to-shore communications.

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Sometimes a wave can have components of both ac and dc. The simplest example of an ac/dc combination is illustrated by the connection of a dc source, such as a battery, in series with an ac source, like the utility mains. An example is shown in the schematic diagram of Fig. 9-12. Imagine connecting a 12-V automotive battery in series with the wall outlet. (Do not try this experiment in real life!) Then the ac wave will be displaced either positively or negatively by 12 V, depending on the polarity of the battery. This will result in a sine wave at the output, but one peak will be 24 V (twice the battery voltage) more than the other. Any ac wave can have dc components along with it. If the dc component exceeds the peak value of the ac wave, then fluctuating, or pulsating, dc will result. This would happen, for example, if a 200-Vdc source were connected in series with the utility output. Pulsating dc would appear, with an average value of 200 V but with instantaneous values much higher and lower. The waveshape in this case is illustrated by Fig. 9-13.

Technology is advancing in the realm of solar-electric energy; someday a significant part of our electricity might come from photovoltaic power plants These would generate dc High voltages could be attained by connecting giant arrays of solar panels in series But there would be a problem transforming this voltage down to manageable levels for consumer use Thomas Edison is said to have favored dc over ac for electrical power transmission in the early days, as the electric utilities were first being devised and constructed His colleagues argued that ac would work better But perhaps Edison knew something that his contemporaries did not There is one advantage to dc in utility applications, and it involves the transmission of energy over great distances using wires Direct currents, at extremely high voltages, are transported more efficiently than alternating currents.

Hybrid ac/dc combinations are not often generated deliberately. But such waveforms are sometimes seen at certain points in electronic circuitry.

In 1921, the Detroit Police Department inaugurated the first land-based mobile application for radio communications when they installed one-way radios in patrol cars, the original calling all cars application The system required police officers to stop at a phone (see Figure 5-11) to place a call to their precinct when a call came in However, the ability to quickly and easily communicate with roving officers represented a giant step forward for the police and their ability to respond quickly to calls Unfortunately, the system was not without its problems Even though the transmitter was powerful, Detroit s deep concrete canyons prevented the signal from reaching many areas Equally vexing was the problem of motion.

The wire has less effective resistance with dc than with ac, and there is less energy lost in the magnetic fields around the wires Direct-current high-tension transmission lines are being considered for future use Right now, the main problem is expense Sophisticated power-conversion equipment is needed If the cost can be brought within reason, Edison will be vindicated..

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