Gift of Love. Mark in Texas History. Volunteer Central. Restaurant Reports. Traffic On The Go. About Us. Send Us A News Tip. Closed Captioning. Investigate TV. Gray DC Bureau. Latest Newscasts. Forever Flashlight: "Does It Work? Published: Jul. Share on Facebook. Each time the magnet moves through the coil of wires, the magnet generates a pulse of electricity. This is what happens when you shake the flashlight. A capacitor allows you to use the flashlight without continuously shaking it.
A capacitor works basically as a battery but with one big advantage: It charges immediately and, after just a few shakes, the flashlight is already usable. Hand power doesn't just come from shaking a magnet back and forth. It's actually more common to find devices powered by hand-cranking. Pictured here is a boat's standing light that's powered in exactly this fashion. This radio is both solar-powered and able to produce hand-cranked electricity to run.
These kinds of generators require electric pressure to gain enough voltage to transfer it into current. However, too small of a wire won't allow enough voltage to be created either. For this project however, the small 8 guage wire that's recomended is a great guide to what size of wire makes a good ballence of capacity and pressure.
Also note that the reason that the wire used has been isolated with plastic is because if the bare wire was touching the rest of the wires in the coil, you would no longer have a coil, but a ring, which defies the point of the coil needed. Activity: taking a quick look at your image, I can see that there's about enough space to fit 3 of your magnet set ups between the coil the end of your pipe.
This means that the magnet has further to go before reactivating the coil. Yes, you want your magnet to fully leave the coil, but you don't need much space between the coil and your magnet to do so. By shortnening yiur pipe thos way, you'll create more activity in the coil part as you shake it. Reply 6 years ago on Introduction. There could be many factors that could effect the outcome. The farther away the wire is, the less effected it is by the magnet.
Also, make sure the windings are nice and tight. You may also want to try to use one big magnet instead of four stacked together. The size of the magnet will also effect the voltage output. Consider placing a capacitor into your circuit to help keep a steady light if you haven't done so already.
Reply 4 years ago. I had one of these that my brother gave me, it was a commercially made one. I had it in my carry on bag going through Boston airport. The TSA inspector was very interested in it after X-raying my stuff, pulling me aside to examine it. After showing it was not dangerous, he let me take it, but with the coil and magnet and capacitor wiring it sure looked suspicious on the examiner's screen.
Reply 5 years ago. I understand why they would want to look at it, but it's very irritating to me that they pretty much thing everything is a bomb these days. My aunt was delayed because of her phone battery. Yes I could see how they would want to take a closer look at it This is really neat and simple.
Would there be any advantage to using an N52 over an N42? Would a magnet length greater than 1" give better results? Is there a formula of magnet size , tube length and coil turns to determine current output?
A N52 magnet would have a bit of a higher magnetic field, which could produce a higher voltage output, but it probably wouldn't be significant. I'm not sure if a greater length magnet would make a huge difference in the output, but I would assume it would take less work to produce light, not as much vigorous shaking as a smaller magnet.
As far as a formula How deep into electrical engineering do you want to dive? There is ton's of stuff to go into this. Check out this link for a common formula for a solenoid.
Electromagnetic Induction - A Shaking Flashlight. Electromagnetic Induction - A Shaking Flashlight An electromagnetic flashlight with transparent barrel lets you see how a moving magnet within a coil of wire will induce a current. In the scientific demo model pictured on the right: The electrical energy produced is stored in a capacitor that can be charged hundreds of thousands of times.
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