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How is light produced in the following?

  1. Aug 23, 2010 #1
    I don't know how Electricity is able to conduct light, please be detailed.

    Liht Bulbs
    Incandescent bulbs

    I just wonder how electricity flows through the Tungsten wire (why is the wire tungsten) and can cause light to be emitted.
  2. jcsd
  3. Aug 23, 2010 #2


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    Staff: Mentor

    Light is emitted by an incandescent light bulb because the flowing elecricity makes the filament hot. Hot objects emit light due to black body radiation: http://en.wikipedia.org/wiki/Black_body
  4. Aug 23, 2010 #3


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    Staff Emeritus
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    Electricity flows through tungsten (and other metals) because many of the electrons are not bound to just one atom, and can easily move around throughout the metal.

    The wire in incandescent bulbs is made from tungsten because tungsten is durable, conducts electricity, and has a high melting point.
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