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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
  video  - Back EMF in an Inductor
  video  - LR Circuit w/ Function Generator
 LR Circuit w/ Battery
  video  - Ringing LC Circuit w/ Function Generator
 Ringing LC Circuit w/ Battery
 Complex Circuits
 Semiconductors And Tubes
 Transmission Lines and Antennas

 video  - Ringing LC Circuit w/ Function Generator


To illustrate the properties of a simple LC circuit with function generator during charging and discharging.


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  DEMO VIDEO DOWNLOAD / no audio / 854x480 / 5.69Mb/s / 72MB size  

Charging/Discharging LC Circuit: Use the same circuit setup as in our "Series LCR Circuit, Resonance" demo 5L20.20 listed under "Complex Circuits". For example, in clockwise order, function generator -> #14 light bulb (or 10Ω resistor), 4.25mH inductor w/ 84Ω internal resistance, 0.47μF capacitor. As shown in the image below, green trace (Channel-4) measures the voltage drop across capacitor, magenta trace (Channel-3) measures AC input voltage. Set the function generator output to a square wave and a frequency much lower than the natural resonant frequency of the LCR circuit (ie. 100Hz with 10Ω).