Electricity/Magnetism




Resistance

5D20.10 Resistance and Temperature
Use: Coil resistance is so high that 6v bulb will not glow with power supply set to 12v. Cool coil with liquid nitrogen until resistance drops low enough for current to increase until small light bulb glows.

 
Setup: Assembled as needed. At least 1 day advance notice needed or bring your own LN
Equations: Resistance proprtional to resistivity. Resistivity varies with temperature.
Safety Issues: Very low temperature


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Copyright ©1996, James Clark