What are Thomas Alva Edison's contributions in science?

But the problem was that they don't know how to make enough power to power the light bulb better. The solution to their problem was that they use dynamo as their power source. This is an important contribution to science because now people have lightbulb to light their homes. read more

Thomas Edison's Contributions What a great inventor he was!! He invented the electric locomotive,phonograph,electric pen and copying system,kinetoscope,improved the telephone and improved the stock ticker and most importantly he invented the electric light bulb. read more