1-Ligh bulb.
2- In 1802,
Humphry Davy invented the first electric light. 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. His
invention was known as the Electric Arc lamp. while it produced light, it
didn’t produce it for long and was much too bright for practical use. the next
seven decades, other inventors also created “light bulbs” but no designs
emerged for commerical application. in 1840, British scientist Warren de la Rue
enclosed a coiled platinum filament in a vacuum tube and passed an electric
current through it. In 1850 an English physicist named Joseph Wilson Swan
created a “light bulb” by enclosing carbonized paper filaments in an evacuated
glass bulbIn. 1878, Thomas Edison began serious research into developing a
practical incandescent lamp and on October 14, 1878, Edison filed his first
patent application for "Improvement In Electric Lights". However, he
continued to test several types of material for metal filaments to improve upon
his original design. His discovery marked the beginning of commerically
manufactured light bulbs and in 1880, Thomas Edison’s company, Edison Electric
Light Company begain marketing its new product.
3- The invention of the light bulb changed the world in many ways. The light bulb also had wide-reaching social and economic consequences. Interior lighting changed the structure of society, allowing activities to extend into the night. Industrial plants and other businesses could operate all night long Electric lighting also allowed cities to stay active into the night, changing the natural rhythm of society and allowing people to stay up late.
