History of the Light History of the Light BulbBulb

by Noah Shpakby Noah Shpak

The Beginning of a New EraThe Beginning of a New Era

In the early 1800s - candles, oil In the early 1800s - candles, oil lanterns, and gas lamps.lanterns, and gas lamps.

In 1809, chemist, Humphrey Davy In 1809, chemist, Humphrey Davy began researching the incandescent began researching the incandescent light bulblight bulb

Concept and CostConcept and Cost

The design relied on the high melting The design relied on the high melting point of platinum that would allow it point of platinum that would allow it to operate at high temperatures.to operate at high temperatures.

Although it was an efficient design, Although it was an efficient design, the cost of the platinum made it the cost of the platinum made it impractical for commercial use. impractical for commercial use.

A Step ForwardA Step Forward

Many other scientists improved the initial Many other scientists improved the initial design. Thomas Edison, however, design. Thomas Edison, however, developed the first practical incandescent developed the first practical incandescent light bulb.light bulb.

A Break ThroughA Break Through

The invention of ductile tungsten The invention of ductile tungsten sparked the development of the sparked the development of the modern tungsten light bulb in 1906-modern tungsten light bulb in 1906-10. Ductile tungsten has many 10. Ductile tungsten has many favorable properties:favorable properties:

•a high melting point: 3,410 C a high melting point: 3,410 C •low evaporation rate at high low evaporation rate at high

temperatures: 10-4 torr at 2,757 C temperatures: 10-4 torr at 2,757 C •tensile strength greater than steel tensile strength greater than steel

Structure of Today’s Light BulbStructure of Today’s Light Bulb

Light Bulbs of TodayLight Bulbs of Today

The Light bulb of today has:The Light bulb of today has:• wide, low-cost availability wide, low-cost availability • easy incorporation into electrical systems  easy incorporation into electrical systems  • adaptable for small systems adaptable for small systems • low voltage operation, such as in battery powered low voltage operation, such as in battery powered

devices devices • wide shape and size availability wide shape and size availability

The FutureThe Future

In the future, light bulbs will be even In the future, light bulbs will be even smaller and brighter. smaller and brighter.

Thank YouThank You

This has been a Noah This has been a Noah Shpak productionShpak production

BibliographyBibliography Edison. (n.d.). Edison. (n.d.). Edison's Light BulbEdison's Light Bulb. Retrieved September 8, . Retrieved September 8,

2011, from www.passion-4-pizza.com/history/pizza2011, from www.passion-4-pizza.com/history/pizza Light Bulb Picture. (n.d.). Light Bulb Picture. (n.d.). Light Bulb PictureLight Bulb Picture. Retrieved . Retrieved

September 7, 2011, from September 7, 2011, from goshycab.com/wp-content/uploads/2010/09/5-light-bulb.pnggoshycab.com/wp-content/uploads/2010/09/5-light-bulb.png

Mrs. Steiner's Chemistry - Part 10. (n.d.). Mrs. Steiner's Chemistry - Part 10. (n.d.). McCann Technical McCann Technical SchoolSchool. Retrieved September 8, 2011, from . Retrieved September 8, 2011, from http://blogs.mccanntech.org/steinerchemistry/page/10/http://blogs.mccanntech.org/steinerchemistry/page/10/

The Light Bulb. (n.d.). The Light Bulb. (n.d.). History of the Light BulbHistory of the Light Bulb. Retrieved . Retrieved September 7, 2011, from September 7, 2011, from invsee.asu.edu/modules/lightbulb/meathist.htmlinvsee.asu.edu/modules/lightbulb/meathist.html