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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