l i g h t  b u l b  ** By  PopZ BenZ SonZ
History Changes On <ul><li>In addressing the question  &quot; Who invented the incandescent lamp? &quot;  historians Rober...
The first light Bulb
Commercialization
Properties
Power <ul><li>Incandescent light bulbs are usually  marketed  according to the  electrical   power  consumed .  This is me...
New light bulb
<ul><li>Thank You </li></ul>
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Light bulb

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Light bulb

  1. 1. l i g h t b u l b ** By PopZ BenZ SonZ
  2. 2. History Changes On <ul><li>In addressing the question &quot; Who invented the incandescent lamp? &quot; historians Robert Friedel and Paul Israel list 22 inventors of incandescent lamps prior to Joseph Wilson Swan and Thomas Edison . They conclude that Edison's version was able to outstrip the others because of a combination of three factors : an effective incandescent material, a higher vacuum than others were able to achieve and a high resistance lamp that made power distribution from a centralized source economically viable . </li></ul>
  3. 3. The first light Bulb
  4. 4. Commercialization
  5. 5. Properties
  6. 6. Power <ul><li>Incandescent light bulbs are usually marketed according to the electrical power consumed . This is measured in watts and depends mainly on the resistance of the filament, which in turn depends mainly on the filament's length, thickness, and material . For two bulbs of the same voltage, type, color, and clarity, the higher - powered bulb gives more light . </li></ul><ul><li>The table shows the approximate typical output, in lumens , of standard incandescent light bulbs at various powers . Note that the lumen values for &quot; soft white &quot; bulbs will generally be slightly lower than for standard bulbs at the same power, while clear bulbs will usually emit a slightly brighter light than correspondingly powered standard bulbs </li></ul>
  7. 7. New light bulb
  8. 8. <ul><li>Thank You </li></ul>
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