爱迪生一生发明了许多东西,然而,最受欢迎的是电灯,因为电灯的出现,意味着又有了一轮太阳,人们的活动也不再受到黑夜制约了。早在1821年,英国科学家戴维和法拉第就发明了一种叫电弧灯的电灯。这种电灯用炭棒作灯丝。它虽然能发出亮光,但是光线刺眼,耗电量大,寿命也不长,因此很不实用。“电弧灯不实用,我一定要发明一种灯光柔和的电灯,让千家万户都用得上。”爱迪生暗下决心。于是,他开始试验作为灯丝的材料:用传统的炭条作灯丝,一通电灯丝就断了。用钌、铬等金属作灯丝,通电后,亮了片刻就被烧断。用白金丝作灯 Edison invented many things in his life, however, the most popular is the electric light, because the electric light, it means that there is another round of sun, people’s activities are no longer subject to the night constraints. As early as 1821, British scientists David and Faraday invented a lamp called arc lamp. This lamp with a carbon rod for the filament. Although it can emit light, but the light glare, power consumption, life expectancy is not long, it is not practical. “The arc lamp is not practical, I must invent a soft light lamp, so that millions of households have access. ” Edison secretly determined. So he started experimenting with the material of the filament: with a conventional carbon filament as a filament, a filament was broken. With ruthenium, chromium and other metal filament, power, the bright moment was blown. Use white gold wire as light