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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
 Electromotive Force And Current
 DC Circuits
 Magnetic Materials
 Complex Circuits
 Semiconductors And Tubes
 Transmission Lines and Antennas
 Power Loss in Transmission Lines
 Flash Light Radio
 Fiber Optics Coupled Audio Device
 Lecher Lines
  video  - Microwave Oven Experiments
  video  - Electromagnetic Radiation
 FM Radio
 Spark Gap Tesla Coil

Flash Light Radio


To demonstrate basic properties of modulated electromagnetic wave and introduce the basic of fiber optic transmission lines.


Hook up an audio source (Walkman, radio or CD player) to an amplifier and feed the amplifier output to a flashlight. Adjust the volume to have flashlight bulb shine brightly. Connect the output of the solar cell to an amplifier and the amplifier output to a speaker.
Point the Walkman driven flashlight to a solar cell and listen to the music coming out of the speakers.


With an incandescent light bulb the quality of transmission is poor but the idea comes across nicely.