Edison effect

Seeking to improve his lightbulb by making the filament last longer, Edison discovered that the flow of electricity from a hot filament to a cold wire across a gap in a vacuum tube. This phenomenon laid the groundwork for the future science of electronics.
 Thomas Edison United States 1883 Edison effect

Seeking to improve his lightbulb by making the filament last longer, Edison discovered that the flow of electricity from a hot filament to a cold wire across a gap in a vacuum tube. This phenomenon laid the groundwork for the future science of electronics.