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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
 Ohm's Law
 Resistivity of a Pencil
 Resistive Heating of Nichrome Wire
 Blowing a Fuse
 Wheatstone Bridge
  video  - Wheatstone Bridge II
  video  - Circuit Analysis
  video  - RC Circuit w/ Function Generator
 RC Circuit w/ Battery
 RC Time Constant (DECAY)
 Telephone model as simple DC circuit
 Magnetic Materials
 Complex Circuits
 Semiconductors And Tubes
 Transmission Lines and Antennas

 video  - Wheatstone Bridge II


To demonstrate the principle of the Wheatstone Bridge.


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Short Version: 2 "four outer bulb" combinations

  SHORT VIDEO DOWNLOAD w/ sound / 1920x1080 / 24.19Mb/s / 132MB size  

  SHORT VIDEO DOWNLOAD w/ sound / 854x480 / 5.69Mb/s / 31MB size  

Long Version: 6 "four outer bulb" combinations

  LONG VIDEO DOWNLOAD w/ sound / 1920x1080 / 24.19Mb/s / 528MB size  

  LONG VIDEO DOWNLOAD w/ sound / 854x480 / 5.69Mb/s / 124MB size  

Start out with the bridge having three 25W light bulbs in the outer receptacles. The fourth outer receptacle can be filled with light bulbs of different power ratings, ie. 60W. When a bulb with the same power rating as the other three is placed in the fourth receptacle the bridge is balanced and the central bulb will not be lit.


  • Wheatstone Bridge model