does a three-way light bulb work?
 
A three-way bulb has two filaments in it. The next time one burns out carefully open it (for example, wrap it in a towel and hit it lightly with a hammer) and you will see the two separate filaments. For the lowest setting, one filament comes on (it might be a 50 watt filament). For the next setting, the second filament comes on (it might be a 100 watt filament). For the thrid setting both come on, for a total of 150 watts. Look also at then end of the bulb's base and you will be able to see how the lamp controls the two filaments.
 

 
  • SECURITY CLOSE TO HOME
  • does a candle work?
  • U.S. Customs releases new shipping regulations
  • United Airlines enhances security with fiber-optic transmission equipment
  • New Harmony X10 Two Wire Dimmer Module
  • Exclusive range-control Motion Detector
  • Home Dry Cleaning Works
  • DIGITAL WATCHDOGS
  • Seven Hot Technologies
  • Wireless Handheld Video Monitor
  • The changing technology landscape
  • Security Camera Product