Lighting up the world since 1879
No air + high resistance = success
To make the 1st practical light bulb, Edison had to create a bulb that would burn for a useful amount of time and could be fairly easily installed and used. He did this by 1) making a bulb that had no oxygen in it, so it wouldn't catch on fire or melt, and 2) making a filament that had a high resistance to electricity, so it didn't use very much energy. Created in Menlo Park, New Jersey, Edison's first bulb burned out after 13 1/2 hours. Just a year later, he created a filament that would burn for 1200 hours.