Why did Thomas Edison make the light bulb?
Thomas Edison. … Edison realized that the problem with Swan’s design was the filament. A thin filament with high electrical resistance would make a lamp practical because it would require only a little current to make it glow. He demonstrated his light bulb in December 1879.
What is the centennial light bulb made out of?
Tungsten is a metal and its resistance increases with rising temperature. Carbon is a semiconductor and its resistance decreases with rising temperature. The Centennial Bulb has a carbon filament in a vacuum bulb. It was made by the Shelby electric company in the late 1890s.