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2001
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December
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In the Laboratory
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JCE Classroom Activity
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LEDs Are Diodes
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George C. Lisensky
Department of Chemistry, Beloit College, Beloit, WI 53511
S. Michael Condren
Department of Chemistry, Christian Brothers University, Memphis, TN 38104
Cynthia G. Widstrand, Jonathan Breitzer, and Arthur B. Ellis
Department of Chemistry, University of Wisconsin-Madison, Madison, WI 53706
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December 2001
Vol. 78 No. 12
p. 1664A
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| Abstract |
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In this activity 50-socket strands of incandescent holiday lights are cut to produce 2-socket strands and 6-socket strands. One of the incandescent bulbs can be replaced with a light-emitting diode (LED). Typical LED circuits contain a resistor to limit current flow; in these circuits that function is performed by the remaining incandescent bulb(s). The diode nature of LEDs is demonstrated, as well as the energy associated with different wavelengths of light. The activity illustrates the structure and properties of matter, the interactions of energy and matter, the relationship of energy and color, and the contributions of chemistry to high-tech materials.
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| More Information |
 Citation |
Lisensky, George C.; Condren, S. Michael; Widstrand, Cynthia G.; Breitzer, Jonathan; Ellis, Arthur B. J. Chem. Educ. 2001 78 1664A.
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Keywords |
Atomic Properties / Structure; Introductory / High School Chemistry; Materials Science; Nanotechnology; Solid-State Chemistry; Teaching / Learning Aids
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History |
Created:
Last Updated: |
November 2, 2001
April 14, 2005
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2001
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1664A
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