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Al Tobias (wat4y) - Office: Gibson S123 & Physics 218, (434) 924-0538

Physics Demo Manual

Demonstrations are cataloged according to PIRA Bibliography


Due to Physics Building renovations, the lead time to set up demo requests has increased due to the need to transport equipment across campus. Please be kind and let me know well ahead of time what you need.

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 Electric Fields And Potential
 Current and Resistance
  video  - Resistance Model
  video  - Temperature Effects on the Resistance of Copper Wire
 Temperature Effects on Resistivity
  video  - Superconducting Wire
 Electromotive Force And Current
 DC Circuits
 Magnetic Materials
 Complex Circuits
 Semiconductors And Tubes
 Transmission Lines and Antennas

 video  - Temperature Effects on the Resistance of Copper Wire


To show that the resistance of copper wire drops when lowered to the temperature of liquid nitrogen.


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  DEMO VIDEO DOWNLOAD / no audio / 1920x1080 / 24.19Mb/s / MB size  

  DEMO VIDEO DOWNLOAD / no audio / 854x480 / 5.69Mb/s / MB size  

Connect the circuit to the battery and observe the brightness of the lamp with coil warm at room temperature. Then immerse the copper coil into the liquid nitrogen and note the change in brightness. An ammeter can be used to show the corresponding rise in the current.


After showing the increase in lamp brightness (and current), remove copper coil from liquid nitrogen to allow coil & stick to warm up for next lecture, since it takes some time to for it to warm up. Disconnect battery!


  • 6 V Car Battery
  • Clear dewar
  • Bar w/ Coiled Copper and Lamp