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light bulbs

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thames thames

on 11 October 2015

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Transcript of light bulbs

light bulbs
where is the most common place to make
light bulbs!!!!!!
its made in a factory with full
of machine
how it works
WHAT DO YOU THINK??????????????????????????
there are three different types of light bulbs
thanks for swiching on
Want to find out more go to " Investigation of the light bulbs Davy, Swan and edison
it was invented in
by julia kopac
little video how they make it
Light bulbs have a very simple structure. At the base, they have two metal contacts, which connect to the ends of an electrical circuit. The metal contacts are attached to two stiff wires, which are attached to a thin metal filling.
The Invention of the Light Bulb: Davy, Swan and Edison Light Bulb

Light Bulb The first electric light was made in 1800 by Humphry Davy, an English scientist. He experimented with electricity and invented an electric battery. When he connected wires to his battery and a piece of carbon, the carbon glowed, producing light. This is called an electric arc.
Much later, in 1860, the English physicist Sir Joseph Wilson Swan (1828-1914) was determined to devise a practical, long-lasting electric light. He found that a carbon paper filament worked well, but burned up quickly. In 1878, he demonstrated his new electric lamps in Newcastle, England.

In 1877, the American Charles Francis Brush manufactured some carbon arcs to light a public square in Cleveland, Ohio, USA. These arcs were used on a few streets, in a few large office buildings, and even some stores. Electric lights were only used by a few people.

The inventor Thomas Alva Edison (in the USA) experimented with thousands of different filaments to find just the right materials to glow well and be long-lasting. In 1879, Edison discovered that a carbon filament in an oxygen-free bulb glowed but did not burn up for 40 hours. Edison eventually produced a bulb that could glow for over 1500 hours.

Lewis Howard Latimer (1848-1928) improved the bulb by inventing a carbon filament (patented in 1881); Latimer was a member of Edison's research team, which was called "Edison's Pioneers." In 1882, Latimer developed and patented a method of manufacturing his carbon filaments.

In 1903, Willis R. Whitney invented a treatment for the filament so that it
you should look at some of this
Thomas Edison in 1879
but Humphrey Davy created the first light
in 1800 !!!
usually the light bulbs colors are yellow, white and clear

The classical bulb that Edison
discovered over hundred
years ago
Unlike the classical bulbs
halogen lamps provide superior
durability and light output.
It is type of bulb that has grown
in recent years as there are
new designs that can be
adapted to ordinary lamps
Full transcript