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(27 votes) Published: Mar 18, 2003 12:00 a.m. Viewed 684 times
4 - 1cm x 2cm x 5cm ceramic magnet, Radio Shack #64-1877 $3.96 for 4
1 - #30 Magnet wire 200ft, Radio Shack spools #278-1345 $3.99
1 - Miniature Incandescent Lamp, 1.5V 25mA Rad. Sh. #272-1139 $1.29
1 - Cardboard strip, 8cm x 30cm
1 - Large nail, 8cm long or more
Misc. - Knife or sandpaper to strip the wires
Misc. - tape to hold wire down
Optional: hand drill or electric drill to spin it (hand drill is best)
This is an AC electric generator which is capable of lighting up a tiny incandescent light bulb. The generator is made up of a hollow-ended cardboard box with a nail through the center, many turns of copper wire wound around the box, and four larger magnets clamped around the nail. When the nail and magnets are spun fast by hand, the little light bulb lights up dimly.
I wrote this article because I found lots of projects for making a simple electric motor, but nobody gave the secret for making a generator. Well, here it is: use strong magnets, lots of fine wire, and a special light bulb which only needs 1/2 volt. Also, don’t bother making a "commutator", just hook the wires directly to the bulb. It’s much simpler that way but the generator will produce AC (alternating current).