Lightbulb (student preso)

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student presentation
general physics 1
presentation 3 group 5
electricity in our daily lives
7 mar 2009

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Lightbulb (student preso)

  1. 1. Prince Witawat Puttipong Samabat
  2. 2. <ul><li>Humphry Davy </li></ul><ul><li>However, Thomas Edison </li></ul><ul><li>was the man who perfected </li></ul><ul><li>our light bulb, which last </li></ul><ul><li>1500 hours. </li></ul>
  3. 3. <ul><li>Humphry Davy was the first person who implemented electric power into light bulb. Initially, light bulb was using gas as the primary energy. However Humphry Davy invented and electric battery which he eventually connected it to a piece of carbon which produced light. However it was lasted for only 40 hours. </li></ul>
  4. 4. <ul><li>Initially, light bulb was not long </li></ul><ul><li>lasting. On the right, is the picture </li></ul><ul><li>of Thomas Edison, the person </li></ul><ul><li>who discovered the material that </li></ul><ul><li>is most suitable for light bulb. The </li></ul><ul><li>material that he used allow the </li></ul><ul><li>light bulb to glow for over 1500 </li></ul><ul><li>hours. </li></ul>
  5. 5. <ul><li>Electricity flows through wires making it heats up </li></ul><ul><li>Then the heat makes it glow </li></ul><ul><li>When electricity passes through something, the electrons were held by the substance that was passing through </li></ul><ul><li>Then the electrons were forced through </li></ul><ul><li>Some of the forces were adsorbed by the metal and given off the heats </li></ul><ul><li>it heats up and the light bulb works </li></ul>
  6. 6. Bulb Type Wattage Lifetime (hours) Watt per Lumen (Efficiency) Comment Incandescent (traditional bulb) 60 1,000 15 Low cost, low efficiency White light-emitting diode (LED) 0.07 10,000 30 Offers color, high cost Compact fluorescent (CFL) 13 9,000 63 Moderate cost, glow Cold cathode fluorescent (CCFL) 9.9 40,000 n/a Extremely long life High-intensity discharge (HID) 18 14,000 100 Very bright, outdoor use
  7. 7. <ul><li>They provide light indoor and when it is dark outside without having to light candle or and oil lamb. </li></ul><ul><li>They are also relatively safe, clean, and easy to operate. </li></ul>

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