The Role Of Electronic Media In Communication

* Ads by Google Human Capital Management Improve outcomes using integrated workforce management solutions. www.apihealthcare.com Electronic media played a very vital role in communication. It played an important role in highlighting problems in society either through Entertainment Dramas or through News, Electronic Media is a source for common people through which they can raise their voice and highlight different issues they want Government to resolve. Electronic Media has influenced people in developing change in attitude towards different situations. Electronic communication has contributed a lot in business environment. They made business meetings through Video, possible and communicating messages between employees like notices etc possible. Electronic Media also made possible communication between employees sitting in different branches and thus developing an organization more into community with people facing similar tasks. Visit this Blurtit Question for more-Can You Write A Short Note On "Role Of Electronic Communication In Modern Office"? Also visit following Blurtit questions: What Is The Role Of Electronic Media In Communication? What is the impact of communication on management trends and how does electronic communication is playing role in business activities? What Is The Role Of Electronic Media In Today's Society? Anonymous Report Was this answer helpful? Yes | No * Ads by Google Information Security Asia's Leading Security Company. MSS, ISO 27001, Security Audit www.xynexis.com * Novartis Fed. Initiative Arturo Morales to Present at CHI's Tri-Con 2012 www.triconference.com/ird Electronic media played a very vital role in communication. Electronic communication has contributed a lot in business environment. They made business meetings through Video, possible and communicating messages between employees like notices etc possible. Electronic Media also made possible communication between employees sitting in different branches and thus developing an organization more into community with people facing similar tasks. Visit this Blurtit Question for more-Can You Write A Short Note On "Role Of Electronic Communication In Modern Office"? It played an important role in highlighting problems in society either through Entertainment Dramas or through News, Electronic Media is a source for common people through which they can raise their voice and highlight different issues they want Government to resolve. Electronic Media has influenced people in developing change in attitude towards different situations. Source: http://www.blurtit.com/q398993.html * Terms of Use * Privacy Policy * Content Disclaime

20 THINGS YOU CAN DO TO CONSERVE ENERGY

Whenever you save energy, you not only save money, you also reduce the demand for such fossil fuels as coal, oil, and natural gas. Less burning of fossil fuels also means lower emissions of carbon dioxide (CO2), the primary contributor to global warming, and other pollutants. You do not have to do without to achieve these savings. There is now an energy efficient alternative for almost every kind of appliance or light fixture. That means that consumers have a real choice and the power to change their energy use on a revolutionary scale. The average American produces about 40,000 pounds of CO2 emissions per year. Together, we use nearly a million dollars worth of energy every minute, night and day, every day of the year. By exercising even a few of the following steps, you can cut your annual emissions by thousands of pounds and your energy bills by a significant amount! Home appliances 1. Turn your refrigerator down. Refrigerators account for about 20% of Household electricity use. Use a thermometer to set your refrigerator temperature as close to 37 degrees and your freezer as close to 3 degrees as possible. Make sure that its energy saver switch is turned on. Also, check the gaskets around your refrigerator/freezer doors to make sure they are clean and sealed tightly. 2. Set your clothes washer to the warm or cold water setting, not hot. Switching from hot to warm for two loads per week can save nearly 500 pounds of CO2 per year if you have an electric water heater, or 150 pounds for a gas heater. 3. Make sure your dishwasher is full when you run it and use the energy saving setting, if available, to allow the dishes to air dry. You can also turn off the drying cycle manually. Not using heat in the drying cycle can save 20 percent of your dishwasher's total electricity use. 4. Turn down your water heater thermostat. Thermostats are often set to 140 degrees F when 120 is usually fine. Each 10 degree reduction saves 600 pounds of CO2 per year for an electric water heater, or 440 pounds for a gas heater. If every household turned its water heater thermostat down 20 degrees, we could prevent more than 45 million tons of annual CO2 emissions - the same amount emitted by the entire nations of Kuwait or Libya. 5. Select the most energy-efficient models when you replace your old appliances. Look for the Energy Star Label - your assurance that the product saves energy and prevents pollution. Buy the product that is sized to your typical needs - not the biggest one available. Front loading washing machines will usually cut hot water use by 60 to 70% compared to typical machines. Replacing a typical 1973 refrigerator with a new energy-efficient model, saves 1.4 tons of CO2 per year. Investing in a solar water heater can save 4.9 tons of CO2 annually. Home Heating and Cooling 6. Be careful not to overheat or overcool rooms. In the winter, set your thermostat at 68 degrees in daytime, and 55 degrees at night. In the summer, keep it at 78. Lowering your thermostat just two degrees during winter saves 6 percent of heating-related CO2 emissions. That's a reduction of 420 pounds of CO2 per year for a typical home. 7. Clean or replace air filters as recommended. Energy is lost when air conditioners and hot-air furnaces have to work harder to draw air through dirty filters. Cleaning a dirty air conditioner filter can save 5 percent of the energy used. That could save 175 pounds of CO2 per year. Small investments that pay off 8. Buy energy-efficient compact fluorescent bulbs for your most-used lights. Although they cost more initially, they save money in the long run by using only 1/4 the energy of an ordinary incandescent bulb and lasting 8-12 times longer. They provide an equivalent amount of bright, attractive light. Only 10% of the energy consumed by a normal light bulb generates light. The rest just makes the bulb hot. If every American household replaced one of its standard light bulbs with an energy efficient compact fluorescent bulb, we would save the same amount of energy as a large nuclear power plant produces in one year. In a typical home, one compact fluorescent bulb can save 260 pounds of CO2 per year. 9. Wrap your water heater in an insulating jacket, which costs just $10 to $20. It can save 1100 lbs. of CO2 per year for an electric water heater, or 220 pounds for a gas heater. 10. Use less hot water by installing low-flow shower heads. They cost just $10 to $20 each, deliver an invigorating shower, and save 300 pounds of CO2 per year for electrically heated water, or 80 pounds for gas-heated water. 11. Weatherize your home or apartment, using caulk and weather stripping to plug air leaks around doors and windows. Caulking costs less than $1 per window, and weather stripping is under $10 per door. These steps can save up to 1100 pounds of CO2 per year for a typical home. Ask your utility company for a home energy audit to find out where your home is poorly insulated or energy inefficient. This service may be provided free or at low cost. Make sure it includes a check of your furnace and air conditioning. Getting around 12. Whenever possible, walk, bike, car pool, or use mass transit. Every gallon of gasoline you save avoids 22 pounds of CO2 emissions. If your car gets 25 miles per gallon, for example, and you reduce your annual driving from 12,000 to 10,000 miles, you'll save 1800 pounds of CO2. 13. When you next buy a car, choose one that gets good mileage. If your new car gets 40 miles per gallon instead of 25, and you drive 10,000 miles per year, you'll reduce your annual CO2 emissions by 3,300 pounds. Reduce, reuse, recycle 14. Reduce the amount of waste you produce by buying minimally packaged goods, choosing reusable products over disposable ones, and recycling. For every pound of waste you eliminate or recycle, you save energy and reduce emissions of CO2 by at least 1 pound. Cutting down your garbage by half of one large trash bag per week saves at least 1100 pounds of CO2 per year. Making products with recycled materials, instead of from scratch with raw materials, uses 30 to 55% less for paper products, 33% less for glass, and a whopping 90% less for aluminum. 15. If your car has an air conditioner, make sure its coolant is recovered and recycled whenever you have it serviced. In the United States, leakage from auto air conditioners is the largest single source of emissions of chlorofluorocarbons (CFCs), which damage the ozone layer as well as add to global warming. The CFCs from one auto air conditioner can add the equivalent of 4800 pounds of CO2 emissions per year. Home Improvements. When you plan major home improvements, consider some of these energy saving investments. They save money in the long run, and their CO2 savings can often be measured in tons per year. 16. Insulate your walls and ceilings. This can save 20 to 30 percent of home heating bills and reduce CO2 emissions by 140 to 2100 pounds per year. If you live in a colder climate, consider superinsulating. That can save 5.5 tons of CO2 per year for gas-heated homes, 8.8 tons per year for oil heat, or 23 tons per year for electric heat. (If you have electric heat, you might also consider switching to more efficient gas or oil.) 17. Modernize your windows. Replacing all your ordinary windows with argon filled, double-glazed windows saves 2.4 tons of CO2 per year for homes with gas heat, 3.9 tons of oil heat, and 9.8 tons for electric heat. 18. Plant shade trees and paint your house a light color if you live in a warm climate, or a dark color if you live in a cold climate. Reductions in energy use resulting from shade trees and appropriate painting can save up to 2.4 tons of CO2 emissions per year. (Each tree also directly absorbs about 25 pounds of CO2 from the air annually.) Business and community 19. Work with your employer to implement these and other energy-efficiency and waste-reduction measures in your office or workplace. Form or join local citizens' groups and work with local government officials to see that these measures are taken in schools and public buildings. 20. Keep track of the environmental voting records of candidates for office. Stay abreast of environmental issues on both local and national levels, and write or call your elected officials to express your concerns about energy efficiency and global warming. Source :http://www.ecomall.com

www.exploratorium.edu

Aerodynamics Every bicyclist has to overcome wind resistance. Most recreational bicycles in which the rider sits up have very poor aerodynamics. While newer bicycles are being designed with better aerodynamics in mind, the human body is simply not well designed to slice through the air. Bicycle racers are aware of the problem of wind resistance and over the years have developed techniques for reducing it. Bicycle designers and inventors have experimented in developing alternative bicycle designs and HPVs (human- powered vehicles) with an emphasis on better aerodynamic performance. Charley "Mile-a-Minute" Murphy was an early cycling racer. His "mile-a-minute" feat was accomplished in 1899. At that time he traveled faster than the fastest automobile. Notice the large windscreen on the train in front of him which greatly reduced wind resistance. BICYCLE INSTITUTE OF AMERICA Wind Resistance Every cyclist who has ever pedaled into a stiff headwind knows about wind resistance. It's exhausting! In order to move forward, the cyclist must push through the mass of air in front of her. This takes energy. Aerodynmaic efficiency--a streamlined shape that cuts through the air more smoothly--enables a cyclist to travel much faster, with less effort. But the faster the cyclist goes, the more wind resistance he experiences, and the more energy he must exert to overcome it. When racing cyclists aim to reach high speeds, they focus not only on greater power, which has its human limitations, but also on greater aerodynamic efficiency. Aerodynamic drag consists of two forces: air pressure drag and direct friction (also known as surface friction or skin friction). A blunt, irregular object disturbs the air flowing around it, forcing the air to separate from the object's surface. Low pressure regions from behind the object result in a pressure drag against the object. With high pressure in the front, and low pressure behind, the cyclist is literally being pulled backwards. Streamlined designs help the air close more smoothly around these bodies and reduce pressure drag. Direct friction occurs when wind comes into contact with the outer surface of the rider and the bicycle. Racing cyclists often wear "skinsuits" in order to reduce direct friction. Direction friction is less of a factor than air pressure drag. On a flat road, aerodynamic drag is by far the greatest barrier to a cyclist's speed, accounting for 70 to 90 percent of the resistance felt when pedaling. The only greater obstacle is climbing up a hill: the effort needed to pedal a bike uphill against the force of gravity far outweighs the effect of wind resistance. Calculate the Aerodynamic Drag and Propulsive Power of a Bicyclist Fill in the information in the boxes. Velocity is your velocity (mi/hr) as read on a speedometer. + (plus) is forward - (minus) is backward. Wind velocity (mi/hr) is - (minus) if it is a tailwind, + (plus) if it is a headwind (relative to the ground). Weight is in pounds. Grade is the angle of the slope. 0 is flat, 90 is a vertical wall. Click on the "Calculate" button. Notice the drag force and power required to keep you moving at a constant velocity. This calculation requires a JavaScript-capable browser. Notes on the calculator: Please be aware that we've made some assumptions in order to simplify this calculation. For instance, this calculator does not take into account the body position (or size) of the rider in regard to wind resistance. In addition, other factors, such as the coefficient of friction are fixed. Also, if you put in "unrealistic" figures you will get unrealistic results. Finally, please be aware that the "Calories per minute" figure is assuming that the human body is 100 percent efficient--this is not the case (20 percent efficiency is closer). For a more accurate figure try multiplying the "Calories per minute" by a factor of five. Reducing resistance Frame builders and designers have been working on creating more aerodynamically efficient designs. Some recent designs have concentrated on shifting from round tubes to oval or tear-shaped tubes. There is a delicate balancing act between maintaining a good strength-to-weight ratio while improving aerodynamic efficiency. Improvements to wheels have made perhaps the biggest impact. A standard spoked wheel has been described as an "egg beater," creating many small eddies as the tire rotates--creating drag. Disc wheels, while generally heavier than their spoked counterparts, produce less wind drag and turbulence when they spin. Aerodynamic Frame This racing frame uses tear-shaped tubes to reduce drag. While improvements to frames and components have improved aerodynamic performance, the cyclist is the largest obstacle to dramatic improvement. The human body is not very streamlined. Body positioning is important; road cyclists use "drop bars" to allow themselves to reduce their frontal area, which helps reduce the amount of resistance they must overcome. Reducing the frontal area helps riders increase their speed and their efficiency over time. In addition to positioning, small details like clothing can also make a big difference in reducing "skin friction." Tight-fitting synthetic clothing is worn by almost every professional rider, both road and mountain. Many recreational riders are also wearing bicycle clothes for the improvement in aerodynamics as well as comfort. Aerodymanics Page: 1 of 2 Select "Forward" below to continue Bottom Navigation bar Source : © Exploratorium

http://encyclopedia2.thefreedictionary.com

broadcasting (redirected from TV transmission) Also found in: Dictionary/thesaurus, Legal, Wikipedia, Hutchinson 0.01 sec. Ads by Google Digital Analog Design News Read the Latest Electronics Design News & Daily Updates from EW- www.ElectronicsWeekly.com/Design Transmission Solenoids Rebuilt valve body-518-4l60e-saturn 01m-700r4-taat-46re-47re-48re-taat 800700tran.com Mercruiser Parts & Tools Tech advice, manuals Sterndrives and Engines sterndrives.com broadcasting, transmission of sound or images to a large number of receivers by radio or television. In the United States the first regularly scheduled radio broadcasts began in 1920 at 8XK (later KDKA) in Pittsburgh. The sale of advertising advertising, in general, any openly sponsored offering of goods, services, or ideas through any medium of public communication. At its inception advertising was merely an announcement; for example, entrepreneurs in ancient Egypt used criers to announce ship and cargo ..... Click the link for more information. was started in 1922, establishing commercial broadcasting as an industry. Radio became increasingly attractive as an advertising medium with the coming of network operation. A coast-to-coast hookup was tentatively effected early in 1924, and expansion of both audience and transmission facilities continued rapidly. By 1927 there were two major networks, and the number of stations had so increased that interference became a serious problem. Legislation (see Federal Communications Commission Federal Communications Commission (FCC), independent executive agency of the U.S. government established in 1934 to regulate interstate and foreign communications in the public interest. ..... Click the link for more information. ) designed to meet this problem was enacted, and the government has since maintained some control over the technical and business activities of the industry. By 2003, 4,804 commercial radio stations were operating in the original AM (amplitude modulation) broadcast band. Commercial broadcasting on the FM (frequency modulation) band began in 1941. The number of FM stations passed the number of AM in 1983; in 1998 there were 6,179 commercial FM stations on the air, and 2,400 noncommercial stations. Experiments in broadcasting television began in the 1920s but were interrupted by World War II. In 1996 there were 1,340 commercial television stations on the air, and 600 noncommercial stations. There were also more than 2,000 low-power television stations. The Corporation for Public Broadcasting was established in 1968 as a not-for-profit, nongovernmental agency to finance the growth of noncommercial radio and television; by 2003 the network served more than 200 television and nearly 800 radio stations. New and competing technologies have had a tremendous impact on broadcasting and the ways in which people use it. With the availability of small, high-quality portable and automotive receivers, it has been estimated that less than half of all radio listening takes place in the home. Cable television cable television, the transmission of televised images to viewers by means of coaxial cables. Cable systems receive the television signal, which is sent out over cables to individual subscribers, by a common antenna (CATV) or satellite dish. ..... Click the link for more information. , which reached more than 67% of all U.S. homes by 2003, gave consumers a wider choice of programs from which to choose. The new cable channels, most of them highly specialized in the programming they offer, coupled with the wide availability of videocassettes and DVDs, have reduced the influence of the broadcast networks. Television signals are also now transmitted from satellites direct to household satellite dishes. See radio radio, transmission or reception of electromagnetic radiation in the radio frequency range. The term is commonly applied also to the equipment used, especially to the radio receiver. ..... Click the link for more information. ; television television, transmission and reception of still or moving images by means of electrical signals, especially by means of electromagnetic radiation using the techniques of radio and by fiberoptic and coaxial cables. ..... Click the link for more information. . Bibliography See E. Barnouw, A History of Broadcasting in the United States (3 vol., 1966–70); J. R. Bittner, Broadcasting and Telecommunication: An Introduction (1985); S. J. Douglas, Inventing American Broadcasting, 1899–1922 (1997); J. R. Walker and D. A. Ferguson, The Broadcast Television Industry (1998). The Columbia Electronic Encyclopedia® Copyright © 2007, Columbia University Press. Licensed from Columbia University Press. All rights reserved. www.cc.columbia.edu/cu/cup/ broadcasting Transmission of sound or images by radio or television. After Guglielmo Marconi's discovery of wireless broadcasting in 1901, radio broadcasting was undertaken by amateurs. The first U.S. commercial radio station, KDKA of Pittsburgh, began operation in 1920. The number of stations increased rapidly, as did the formation of national radio networks. To avoid radio monopolies, Congress passed the Radio Act of 1927, which created the Federal Communications Commission to oversee broadcast operations. In the 1930s and '40s, the “golden age of radio,” innovations in broadcast techniques and programming made radio the most popular entertainment medium. Television broadcasting began in Germany and Britain in the 1930s. After World War II, the U.S. took the lead, and television stations soon overshadowed radio networks. Color television broadcasts began in 1954 and became widespread in the 1960s. By the 1980s, satellite transmission of live television further expanded the field of broadcasting. See also ABC, BBC, CBS, CNN, NBC, PBS. For more information on broadcasting, visit Britannica.com. Britannica Concise Encyclopedia. Copyright © 1994-2008 Encyclopædia Britannica, Inc. How to thank TFD for its existence? Tell a friend about us, add a link to this page, add the site to iGoogle, or visit webmaster's page for free fun content. Copyright © 2011 Farlex, Inc.

http://www.crc.gc.ca

Television Systems and Transmission The objective of the Television Systems and Transmission group is to provide the necessary technological knowledge in advanced television systems and transmission technologies to Industry Canada and to the broadcast and telecommunications industry. Fields of expertise include digital television and enhancements to NTSC television. The group supports Industry Canada in meeting its mandate on spectrum management and in developing regulatory frameworks for broadcasting. Guidance is provided to broadcast and telecommunications industries in implementing new broadcast services and developing new equipment. The Television Systems and Transmission group is responsible for monitoring and identifying trends in television transmission technologies and contributing to the planning of future research. The Television Systems and Transmission program is responsible for planning and carrying out a research program in television broadcast signal transmission by: * conducting research in coding, modulation, channel equalization and error correction techniques for the transmission of analog (NTSC) and digital (ATV) television signals over terrestrial off-air, satellite and cable-TV channels; * characterizing transmission channels, in particular terrestrial off-air channels; * developing hardware and software channel simulators; * carrying laboratory and field tests; * developing new concepts for broadcasting services; * studying TV broadcast coverage and spectrum planning tools for digital television systems, such as CRC-COVLAB; * contributing to the development of transmission standards; and * representing Canadian interests in international fora as appropriate. It is also the group's responsibility to design and evaluate the different technologies necessary for the implementation of improved television services and to make sure that Canada selects the best available transmission systems by disseminating information and transferring technology to the industry. For a number of years, the group contributed to the prototype development and evaluation of digital television systems. After years of development, a digital advanced television system standard was proposed by the Advanced Television Systems Committee (ATSC). This standard was adopted in 1996 by the FCC for use in the USA and in 1997 by Industry Canada for use in Canada for over-the-air television broadcasting. For the orderly implementation of digital television broadcasting, critical additional knowledge and information are required with respect to coverage, potential interference with other wireless services and co-existence with the present NTSC analog television during the transition period. Furthermore the ability to use part of the channel capacity for non-programming services such as a variety of data services is an important consideration in the digital television implementation plans of the broadcasters. The user requirements for such services have to be better defined and their technical implications on transmission and distribution techniques have to be assessed. With demand for more video services, new delivery systems are emerging such as Multipoint Distribution System (MDS) and Local Multipoint Communication Systems (LMCS). Interoperability of these various systems and the need to integrate broadcast systems into other information systems and services under the umbrella of the "Information Highway" is another important aspect which has implications on transmission technologies for television service delivery. Further Information: Gilles Gagnon Manager Television Systems and Transmission Tel: (613) 998-5002 Fax: (613) 990-6488 E-mail:gilles.gagnon@crc.gc.ca » * Printer-friendly version * Send to friend * PDF version .sumber: @crc.gc.ca

http://www.collegeofpsychicstudies.co.uk/

Welcome To The College Of Psychic Studies CPSFounded in 1884, the College is a beacon of light and learning for those seeking to explore a consciousness beyond matter. As one of the oldest establishments of our kind, we endeavour to kep in touch with any new developments and educational methods, to continue the College's influential and distinguished history. Our teaching staff, sensitives, healers & counsellors have extensive training in their respective fields and are dedicated to helping with personal, psychic and spiritual development. more about the college Opening Hours The College Monday - Friday 11am - 7pm (phone lines close at 6.30pm) Library Monday - Friday 12.30pm - 6pm Contact Details Telephone: +44 (0)20 7589 3292 Fax: +44 (0)20 7589 2824 Gift Vouchers © 2009 The College of Psychic Studies | Valid XHTML | CSS Home | Membership | Recruitment | Sitemap

TV Buying Guide

What's Your Type?

The television is one of the most significant inventions of the 20th century. For the whole picture, read How Television Works. In the past few years, there have been tremendous leaps in TV technology. Twenty years ago, TV shoppers had very few choices. These days, several TV technologies are competing with one another. This makes TV shopping all the more difficult. Each TV type has strengths and limitations based on the technology being used. Deciding what type of TV is right for you starts with understanding the factors that affect a TV's performance.
Viewing range is an important factor, especially when shopping for a big-screen TV. The viewing angle represents the total area in front of the screen that the image can be seen without distortion. When it comes to viewing range, some TVs are better than others. This is based on the technology used to deliver the picture. For instance, because a plasma TV uses tiny lighted cells to produce the picture, if you are viewing these cells at an angle you will lose picture clarity. A traditional tube TV (CRT) uses a cathode ray to paint the screen with the picture. This method allows for a wide viewing angle.
Black level is your TV's ability to produce the color black. TVs create image color by mixing the colors red, green, and blue. Black is the absence of color and serves to provide detail to an image. Achieving a true dark black is something newer TV technologies such as LCD (liquid crystal display) and plasma are struggling to create. To this day, nothing beats an old-fashioned tube TV (CRT) for black level.
Resolution is the number of pixels per square inch. Pixels are tiny, colored dots that combine to form the picture you see on the TV screen. The more pixels there are on the screen, the higher the resolution. The higher the resolution is, the better the picture quality. Resolution measurements are shown in this type of format: 1280x720. These numbers correspond to the number of horizontal and vertical pixels in the image. To give you an idea of the available range, a CRT TV is capable of up to 480 lines of resolution, while an HDTV can produce 1920x1080. You may see resolution abbreviated to only the second (vertical) number, plus a letter "p" (progressive scan) or "i" (interlaced) -- so, 720p or 1080i.

Burn-in is the term for the damage done to a screen by static images that are displayed for a long time. Both tube TVs and plasma TVs are prone to this kind of damage. When a static image like a stock market crawler, station logo or video game score display is left on the screen for a long time, the image gets burned into the screen by the picture-producing mechanism. Burn-ins will appear as "ghost" images on a screen. The chance of burn in can be reduced on any type of TV by setting the contrast levels at their middle settings and making sure static images are not displayed on a TV for hours at a time. A new technology called auto pixel shift also helps plasma screens resist burn-in.

Glare is created when a TV screen picks up ambient light from the room and reflects it back at the viewer. This is a particular problem with tube TVs that have curved glass screens. To counter this, manufacturers provide flat-screen versions that drastically reduce glare. They are more expensive, but may be well worth the extra money if glare is a problem in your home.
Durability is a desirable trait in anything you buy. Once again, the technologies used are the greatest determining factor in the life span of your new TV. LCDs and CRT TVs are known for their long lives. On the other hand, plasma TVs and projection TVs have much shorter life spans despite their much larger price tag.
Price is an obvious factor when shopping for anything. In the world of TV shopping, price is stacked based on the size and type of television. Plasma and LCDs are more expensive than CRT TVs because the technology is newer and more expensive to produce. The most important thing to remember when TV shopping is that the highest price does not necessarily mean you are going to get the best picture.
Screen size is an interesting limitation that affects all types of TV. The limits are set based on the practicality of implementing a particular type of technology for the screen size in question. For example, a CRT tube TV gets taller and wider as the screen size increases. It also gets deeper and heavier in order to accommodate the larger tube needed to produce the picture at that size. CRTs top out at about 40 inches because any larger would make them impractical. LCDs, which are based on transistors and capacitors, suffer from a similar limitation but for a different reason -- increasing size beyond about 37 inches produces a display that is too likely to contain a bad transistor. Plasma TVs and projectors, on the other hand, really have no limit to screen size other than the price.                                                                                                                                                 

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