https://padlet.com/sonvuong427/p24e1mxp0ezf Được tạo với ý đồ tốt nhất en-us 2019-11-06 15:38:04 UTC 2019-12-12 00:16:28 UTC hello@padlet.com sonvuong427 https://padlet.com/sonvuong427/p24e1mxp0ezf/wish/407519386 Invention
In 1878, genius inventor Thomas Edison (1847-1931) began to study incandescent bulbs but few people were interested.  They think that light is natural.  Many people also refer to filament lamps as ghostly lights and can only be used in fairy tales.  A member of the US Congress once said: "Edison's light bulb is only useful on the other side of the Atlantic, not the United States."  Over time, people must also acknowledge the value that light bulbs bring.  Up to now, electric light bulbs have become indispensable things in human life.  Alternating current 6 inventions were initially criticized badly - Photo 2. Tesla's alternating current has been criticized that could be lethal Edison is the creator of the filament bulb, who is also the  support direct current.  But this scientist was also an opponent of the use of alternating current researched by scientist Nikola Tesla (1856-1943), even though the efficiency of the new current was much better.  Edision once said: "Encouraging the use of alternating current is just a waste of time. Nobody will use it."  There was even an experiment that proved that alternating current could be lethal to counteract the development of this new trend.  However, only a few years later, alternating current has won.  And today, AC is used in all areas of modern life.]]> 2019-11-06 15:46:57 UTC https://padlet.com/sonvuong427/p24e1mxp0ezf/wish/407519386