Categories |
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Mechanics |
Fluid Mechanics |
Oscillation and Waves |
Thermodynamics |
Electricity and Magnetism |
Optics |
Modern Physics |
Astronomy |
[Setup Time: 5 Min.] [Current Condition: OK- still some buzzing from vibration]
A ringing alarm driven with DC voltage is suspended inside a bell jar. The sound fades away as the air is pumped out and returns when vented. The arm of the ringer can still be seen moving up close.
NOTE: do not apply too much voltage (smoke/fire) or in the wrong direction!
Vacuum Jar with Bell Inside by backwall
Vacuum Pump by backwall
DC power supply by backwall
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