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Transcript of Light Bulbs
Bulbs 1802 1880 1906 Now 1835 1840 1872 1903 1910 In 1802, Humphry Davy had invented the
first incandescent light bulb using platinum.
This light bulb was not practical because it
was not bright enough and did not last long
enough, so people did not use it. In 1835, James Bowman Lindsay demonstrated
a Constant Electric Light in Dundee, Scotland
and said the he could read a book one and a
half feet away from the light. Then he came
to the wireless telegraph problem and did not
continue to develop his light any more. In 1840, Warren De La Rue invented an
Incandescent Light Bulb that was made
platinum. He put coiled platinum inside
a vacuum tube and passed an electric
current through the coiled wire. The light
bulb worked, but because of the high cost
of Platinum, they could not sell it. In 1872, the Russian Alexander Lodygin invented
another version of the Incandescent Light Bulb. In
his light bulb, he used two carbon rods and filled
the glass receiver with nitrogen. Later, he showed people his invention at the 1990 world fair in Paris. In 1880, Thomas Alva Edison continued to
improve his light bulb and had invented a
light bulb that had a filament that came
from bamboo. This newly invented light bulb
could last for over 1 200 hours. In 1903, Willis Whitnew invented a filament to put inside a light bulb. This filament was a special filament that would not cause the inside of a light bulb to turn black. He made this filament using metal-coated carbon, a continuation of the Tungsten Filament. In 1910, William David Coolidge an improved way for making Tungsten Filaments. The improved method of making Tungsten Filaments made the filaments last longer than any before and it was not expensive to use the method, which made it very useful. In 1906, the General Electric Company was the first to invent a method for making Tungsten Filaments for Incandescent Light Bulbs. Also, in this year, they also patented their method. But the costs for using this method was too high, so it was not very useful. Fluorescent Light Bulbs Fluorescent Light Bulbs are the newest version of light bulbs. They were invented in 1938 by George Inman with help of a group of scientists from an electricity company called General Electric. Even though the patent was filled by George Inman, many other scientists such as Nicola Tesla contributed to the making of this light with their research, discoveries, and inventions. Fluorescent light bulbs are very useful and good for the environment. This is because they last longer, are better for your eyes, and use less power. Fluorescent lights last for 6 000 to 15 000 hours, and use a fraction of the energy that other lights do. These lights also emit 2 000 times less than other lights of greenhouse gasses, which causes global warming. The Big Question:
Which is more useful and better? To answer that question : I believe that fluorescent lights are more useful and better. Why? Because of so many reasons. One, fluorescent lights are much better for your eyes. The light that they give out is softer than other lights, so our eyes can look comfortably instead of squinting, which will make our eyes feel much better. Another reason is that they are better for our lungs and can help us live in a cleaner world, in terms of air. Because they use less electricity, then less electricity needs to be generated and less pollution will be released into the air. The next reason is that fluorescent light bulbs last much longer than other light bulbs. The average amount of time that other light bulbs last is 1 000 hours, but fluorescent light bulbs can last up to 15 000 hours. This means that your money will be better spent and that you can save money on light bulbs and electricity bills. To sum up, fluorescent lights are better and more useful than other lights because they make our world a cleaner place, they save electricity and money, and they are better for our eyes. Thanks for watching my presentation!
Bye! Incandescent Light Bulbs The Incandescent Light Bulb as we know it was introduced by Thomas Edison in 1892. The invention was not actually Thomas Edison's, because many scientists helped and contributed greatly with their discoveries. But Thomas Edison was the first to patent and sell an Incandescent light that was practical in terms of cost and life span. So, in other words, Thomas Edison used what people had created before and improved them, do that they were practical devices that people would but and be able to use. The Incandescent light bulbs have Tungsten Filaments ( thin metal wire made of a grayish white metal called Tungsten ) and have a glass bulb around them filled with inert gas ( for example helium ). These bulbs are not expensive, and is what most people use in their homes. But this light bulb uses a lot of it's power for heating the filaments, and less than 5% is used to actually produce light. Also, when people make Incandescent lights they produce many greenhouse gasses, and it is not good for the environment or our lungs. (cc) image by rocketboom on Flickr (cc) image by quoimedia on Flickr