"Stefan's Law" light bulb and Multimeters

 

Code Number: 5D20.31

Demo Title: Stefan's Law - Resistance of Light Bulbs

Condition: Excellent

Principle: Temperature vs. Resistance

Area of Study: Electricity & Magnetism

Equipment: 

Variac, "Stefan's Law" light bulb, multimeters.

Procedure:

Plot current and voltage in 5 or 10 volt intervals from 0 to 120 volts.  Plot this on a spread sheet along with the calculated value of the resistance.  You should see a very dramatic rise in resistance as a function of current, which can be related to resistance as a function of temperature.

References:

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