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The best designs use a supercapacitor instead of a rechargeable battery, since these have a longer working life than a battery. This, along with the long-life light-emitting diode which does not burn out like an incandescent bulb, give the flashlight a long lifetime, making it a useful emergency light. A disadvantage of many current models is ...
A standard GravityLight kit would come with an adjustable lamp and a ballast bag. The light would be turned on by filling the bag with approximately 20 pounds (9.1 kg) of weight [ 9 ] and lifting it up to the base of the device; the weight gradually descends over a period of 25 minutes, pulling a cord/strap that spins gears and drives an ...
They use a strong permanent magnet that can freely slide up and down a tube, passing through a coil of wire as it does. Shaking the flashlight charges a capacitor or a rechargeable battery that supplies current to a light source. Such flashlights can be useful during an emergency, when utility power and batteries may not be available.
Maglite (also spelled Mag-Lite, stylized as MAG-LITE) is a brand of flashlight manufactured in the United States by Mag Instrument, Inc. located in Ontario, California, and founded by Anthony Maglica. It was introduced in 1979. [1] [2] Constructed principally of anodized 6061 aluminum, they have a variable-focus beam. Maglites are produced in ...
Disk electromagnetic brakes are used on vehicles such as trains, and power tools such as circular saws, to stop the blade quickly when the power is turned off.A disk eddy current brake consists of a conductive non-ferromagnetic metal disc attached to the axle of the vehicle's wheel, with an electromagnet located with its poles on each side of the disk, so the magnetic field passes through the ...
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