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Heat Transfer Project- Light Bulb
307
The Light Bulb
Presentation by:
Charley Bartley
Sam Lamichhane
Sources:
- "Methods of Heat Transfer." Physicsclassroom.com. The Physics Classroom, n.d. Web. 3 May 2014.
- Littmark, Fanny. "COMSOL Blog." Modeling a Light Bulb, All Forms of Heat Transfer. Comsol.com, 21 Aug. 2012. Web. 05 May 2014
- Holzner, Steven. "Transferring Heat through Radiation." - For Dummies. Dummies.com, n.d. Web. 03 May 2014.
- "How Is Heat Transferred? Conduction -- Convection -- Radiation." How Is Heat Transferred? Conduction -- Convection -- Radiation. Edinformatics, n.d. Web. 05 May 2014.
Conduction, Convection, and Radiation
The tungsten filament of an incandescent light bulb emits electromagnetic radiation in the visible (and beyond) range. This radiation not only allows us to see, it also warms the glass bulb that contains the filament. Put your hand near the bulb (without touching it) and you will feel the radiation from the bulb as well.
Convection drives a flow inside the bulb transferring the heat from the filament throughout the bulb via the movement of fluids (gases inside the light bulb).
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When you touch the bulb, your hand will get hot due to conduction from the hot glass.
A light bulb works by running an electric current through a filament. This causes the filament to vibrate. The filament comes into contact with an inert gas passing its energy into the atoms of the inert gas. The contact with the filament “excites” the electrons and when the atom returns to its normal energy level it releases the extra energy as photons (light).
Some Background Information:
The energy radiated from an object is usually a collection or range of wavelengths. This is usually referred to as an emission spectrum. As the temperature of an object increases, the wavelengths within the spectra of the emitted radiation also decrease. Hotter objects tend to emit shorter wavelength, higher frequency radiation.
Emission spectrum of different molecules.