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LIGHT BULBS (continued): • Today's light bulbs use a filament of tungsten because it's a strong metal that can withstand high temperatures without melting. It is heated to around 4,500 degrees F. This high temperature makes the wire glow with heat. Tungsten comes from the Swedish language, with "tung" meaning heavy and "sten" meaning stone.
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• If there were any air inside the bulb, the filament would burn up. Most bulbs contain nitrogen and argon, which lengthen the life of the filament and prevent electricity from jumping around inside the bulb.
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Quiz Bits
5. If all the power lines in the U.S. were laid end to end, how many times would they stretch to the moon and back? 6. How many hours will a typical incandescent bulb last before burning out? 7. Who was the female star of the movie “Pulp Fiction”? 8. In what TV sitcom did the character Reverend Jim appear?
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1. Which gives off more light: A 75watt bulb, or three 25-watt bulbs? 2. A human being gives off as much heat and energy as a light bulb with about what wattage? 3. T or F: The higher the wattage, the brighter the bulb. 4. What country uses the most power per capita of any country on Earth?
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• Three-way light bulbs have two different filaments: one 50-watt filament and one 100-watt filament. They can be turned on individually or together to produce 150 watts.
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• Different kinds of modern day bulbs such as black light and ozone lamps are used for such things as detecting ringworm, revealing art forgeries, finding minerals and water underground, killing odors, and inducing chickens to lay more eggs. STREETLIGHT FACTS • Vapor lamps use a gas rather than a wire to produce light. Instead of heating up a wire, the gas is energized, giving off light. Mercury vapor gives off a blue light, and sodium vapor gives off a yellow light. Vapor lamps produce more light than incandescent bulbs and last up to 100 times longer. • Fluorescent lights are a type of vapor lamp that use a combination of mercury and argon vapor. When electrical current passes through the vapor, it gives off ultraviolet light. The inside of the bulb is coated with phosphor, which lights up when struck by the ultraviolet light. Fluorescent lights are popular because they use 20% of the energy of incandescent bulbs, and produce 20% of the heat.
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