Faraday Torch

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FAQ about Faraday Torch

Physics capacitor question help? Im stuck on this question: A faraday torch uses a coil through which a magnet moves. The induced current charged a 2.5F capacitor which is connected in series with a diode. 1) At one stage in the charing process the charge on the capacitor is 6.0C. the diode conducts only when it has a potential difference of 0.2v across it in the forward direction. calculate the minimum emf that must be generated across the coil for the capacitor to charge further. 2) When the flux through the coil changed at a rate of 1.25x10e-2 an emf of 3v is generated. calculate the number of turns in the coil. 1. V(min) = V(C)+0.2 V
V(C) = Q/C = 6/2.5 = 2.4 V
V(min) = 2.6 V
2. V = N*d(phi)/dt ==> N = V/(d(phi)/dt) = 3/0.0125 = 240 turns (assuming the missing unit after "1.25x10e-2" is wb/s)

Technical data required for a Faraday torch.? I am intrigued by the the operation of the Faraday torch having such a high output for so low an energy input. The technical details of the circuit and the type of componants used could be most helpful in making such a device for myself INDUCTION TORCH
THE CLEVER STUFF - Using Faraday's Law of Induction, the action of shaking the torch passes a powerful magnet through a copper coil which creates an electric current. This current is then stored in a capacitor which powers two ultra bright LED's which can been seen for up to a mile away and never needs replacing!
After an initial 3 minutes shake to get it going, the torch then only requires 45 seconds of shaking to provide enough electrical energy to power the LED light for up to 5 minutes. A very handy & hardy torch that couldnt let you down if it tried!
* Shake powered
* 100,000 hour bulbs
* Ideal for outdoor activities and emergencies
* Rugged case - shock proof
* Waterproof
* Floats on water
* 20 cm x 5cm

How does the faraday torch store its energy for such a long time? It has an LED light which uses less energy than an incandescent light.
The light contains an induction coil that generates electricity when shaken.

If a comet hit the Earth...? depending on where it hit, what would happen to our vast stores of information? I mean, depending on what got burnt up and who got killed, we might lose some of the most valuable pieces of information in the world. If the comet hit the US, we'd lose the Declaration of Independence. If it hit Egypt, say "bye bye" to the pyramids. If it hit Japan, sayonara Microsoft. (Well, Microsoft Japan. Although the Microsoft in America would probably be wiped out by the tsunami from Japan.) We might also lose valuable information about science and technology. That's a scary thought! Is there nothing we can do? I thought so at first. But then I got to thinking, "What if we stored vast amounts of extremely important information on 500 gigabyte hard drives?" I know about the EMP blast from the comet, so of course they would all be surrounded by Faraday cages, and buried underground so they wouldn't be torched by the heat. So what do you think? Should we start collecting information? Thanks. It doesn't matter what anybody thinks. What matters is what people know. Do you "think" a comet won't hit the Earth or do you "know?" I know about the thousands plus people that would die. As much as I'd like to, it's just not within my power to be able to help them. I wish I could. :( Hey, I care about lives lost just like everyone else. But where would we be today without modern medicine and things like that? Without it people would be dying from things like pneumonia that can be cured with antibiotics and stuff. And also what about older, more important concepts developed by people such as Einstein? Records and books would be destroyed, important concepts and designs lost forever. It is a scary thought. I just read about some recent research that makes it look like the Tunguska Blast was a comet impact. Since they have discovered that comets are rather loosely packed and not very dense there is little chance that one would impact with the ground. This is believed to be the case in Tunguska and it is in many ways much worse. The object, in this case a comet, breaks up and explodes upon impact with the Earth's atmosphere. Now depending on its size, it will determine how far it will penetrate into the atmosphere. If it explodes high enough up, we would not likely feel the effects. Lower down, and you have something like Tunguska. Check out this site: www.aerospaceweb.org. In it they discuss these matters and state that "The (U.S.) Air Force reported that 136 major explosions were detected in the upper atmosphere between 1975 and 1992." These explosions were from collisions with objects from space. They also state that a Tunguska like blast is probably a once every 1,000 years type thing.
As far as our technology and information goes... I read a while back and I have no recollection of the source so it might be somewhat dubious and warrents further looking into, but I think it is about right... Only 10% of our current world population has the skills and knowledge to create and maintain our current level of technology. That is pretty scary.
As far as safe-housing our information, I think networks and the internet do a pretty good job of that. Even a huge event such as Tunguska which destroyed 830 square miles was still localized in comparison to the information super-highway.
Such an event on one coast of the United States would be devestating, but would not directly effect the other coast (at least in terms of actual physical or infrastructure damage).
Now if we get into larger objects impacting Earth, or say the Yellowstone super-volcano erupting, I think we are going to be more concerned with low-tech stuff like finding enough farmable land to feed ourselves more important than the loss of high level technology.

Faraday Torch is from category: Flashlights.