Light bulb

Thomas Alva Edison

• 11 February 1847- 18 October 1931• U.S.A• Bulb, phonograph

Phonograph

Bulb

PARTS1-Outline of Glass bulb2- Low pressure inert gas (argon, nitrogen, krypton, xenon)3-Tungset filament4-Contact wire ( go out of stem)5- Contact wire ( go into stem)6-Support wires (one end embedded in stem; conduct no current)7-Stem (glass mount)8- Contac wire (goes out of stem)

Cap (sleeve)

Insulation (vitrite)Electrical

contact

Types

How produce light

electricity

temperature

glow