Touch Lamp
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How does a touch sensitive lamp work?
A friend of mine recently brought me a touch sensitive light, it's fun to play with but it bugs me that I don't quite understand how it works. My best guess is that by touching the metal part I am interfering with a magnetic field and it's by monitoring that field that the lamp knows if its been touched. Does that sound plausible to the physicists out there? If that isn't right, how does it work?
There's a tiny circuit that controls the switch that would normally control a 3-way light bulb. The lamp body absorbs a tiny amount of charge, like a little battery. When you touch the lamp, the charge transfers to your finger, much like when you feel the spark from a door knob on a dry winter day. The circuit in the lamp is monitoring the amount of charge in body of the lamp, and when you touch it, you change the amount of charge. The charge sensitive monitor "sees" this change and triggers the switch mechanism that controls the amount of electricity going to the bulb.
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