Variac and Light Bulb



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 Code Number :   6B40.10  

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Reprinted by permission of Dick Berg, University of Maryland, for use on this website.

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Condition :   Good  
Principle :   Radiant  Color vs Temperature  
Area of Study :  Astronomy   
Equipment :   Light bulbs (1000 W), Socket, Variac.
  
Procedure :   Put the 1 KW light bulb onto the variac and turn up slowly.  At low voltages the large filament area should look red to a dull orange.  As you now slowly turn up the voltage the filament will get hotter and the corresponding color will be more and more towards white.
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Mail Questions and Comments to:  Dale Stille