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I'd like a very simple answer just to give me an idea of what i have to do. Or a link to a web site that explains it in a simple way, like "coils for dummies" or something like that. I want to produce a voltage with a permanent magnet.

2007-04-16 16:09:57 · 2 answers · asked by Richie Gonzales 1 in Science & Mathematics Physics

2 answers

Are you sure you want voltage, and not power?

Power is the ability to do useful work. If you use lots of turns, using very fine wire, you will generate a high voltage, but the resistance of the wire will limit the amount of power you can get out of it.

There are a number of variables that affect the voltage and power. The voltage depends on the number of turns, and the rate of change of magnetic flux. Get a strong magnet, and it has to move quickly. Also, to maximize the rate of flux change, you have to wind your coil around a piece of iron. Use tape to cover the iron, so the wire doesn't get damaged. The magnet should come close to the iron, but not touch it. By doing some experiments, you can quickly figure out what you need. There is a batteryless flashlight called a "shake flashlight". It has a coil (hundreds of turns) and a magnet that slides in and out of the coil. It generates a few volts, to charge a capacitor that then provides power to the LED, which requires at least 2 volts.

2007-04-22 14:21:58 · answer #1 · answered by Robert T 4 · 0 0

It depends on the strength of the magnet and how quickly you plan to move the coil or the magnet. Try a search on generator construction.

2007-04-16 23:15:41 · answer #2 · answered by Gene 7 · 0 0

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