Resistivity and Temperature – 5D20.00

Wire Coil in Liquid Nitrogen – 5D20.10

• Measure the initial resistance of a resistor (a coil of copper wire) at room temperature.
• Hook the resistor with a 12V light bulb in series powered by a 30 Volt DC power supply.
• The bulb lights dimly or not at all.
• Disconnect the circuit and hook it up again with the multi-meter.
• Immerse the coil in a cup of liquid nitrogen.
• Observe the dramatic drop in the resistance.
• Connect the coil with the light bulb and cool it with liquid nitrogen.
• Turn the power on and the light bulb glows brightly due to reduced resistance of the coil at a very low temperature.

Location: Jacobs B122 – Shelves 158, 213, 228, 300