How we illuminate light around us.
There are three basic types of electric lamps throughout history, there are many designs.
- Incandescent lamps. They have filament through which electrical current is passed that heats the filament which then emits light. Filament is enclosed in a glass bulb which has low atmosphere of inert gas that prevents filament from burning away. - Carbon arc lamps which work on the principle of dielectric breakdown. Arc lamps have two carbon electrodes that are placed at the small distance of each other and are connected to high voltage. Air between them turns into a conductor under the force of the high voltage and after the dielectric breakdown and electric discharge is created which burns with strong light. - Gas discharge lamps are made like tubes that have electrodes on both ends and are filled with vapor that can be ionized and with that can pass electric current and emit light. Fluorescent and neon lamps are gas discharge lamps in the widest use.
source - historyoflamps.com
