Thomas Edison invented the light bulb and phonograph. The document describes the key parts of an incandescent light bulb, including a glass bulb, low pressure inert gas inside, a tungsten filament, contact wires connecting the filament to an electrical contact through the stem, and support wires holding the filament in place without conducting current. It also briefly mentions that electricity heats the filament to a high temperature, causing it to glow and produce light. The document is signed by Marina Lizarralde and Irea Gallastegi, thanking the reader for their attention.

1. Light bulb

2. Thomas Alva
Edison
• 11 February 1847- 18 October 1931
• U.S.A
• Bulb, phonograph

3. Phonograph
Bulb

4. PARTS
1-Outline of Glass bulb
2- Low pressure inert
gas (argon, nitrogen,
krypton, xenon)
3-Tungset filament
4-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)
Electrical contact
Insulation
(vitrite)

5. Types

6. How produce light
electricity
temperature
glow

7. Thanks for your atention
Marina Lizarralde 17
Irea Gallastegi 12