How to make a bonfire using a battery

Naturally, the first thing that comes to mind is a magnifying glass, or just curved glass, or even a polished spoon - in general, in the presence of the sun, you can get fire using almost any reflective surface. And if it happens at night? And if it is cloudy, how often happens in dense taiga forests? If the sun cannot break through the spruce paws at all? So it’s worth rummaging around in your pockets!

Nowhere easier

Suppose you found a regular finger battery in one pocket. AA, AAA, a small “barrel” C, and a thick D will do, it doesn’t matter. Half the battle has already been done, now you need to find in another pocket a chewing gum plate. Or a pack of cigarettes. Or at worst, a chocolate bar - in general, any item that has foil in its packaging. Ideally, a two-layer material is needed, where the foil serves as the upper layer, and the lower layer is paper. But clean foil is also suitable, just have to tinker a bit with it.

You will also need a knife, but if necessary, the foil can be gently torn and without using a sharp blade. So, first cut out a fairly wide strip of foil (approximately 1.5 cm wide).

The length should be such that one end of the strip can touch the positive end of the battery, and the second negative. Now you need to make the central part of the strip thin, that is, create a narrow jumper there (about 2 mm wide). That’s almost all.

Find a flat surface, put something on it that quickly ignites (for example, dry moss, if you are in the woods), and "stick" a jumper on the foil with this material. In our experience, we wrapped the wick of an ordinary candle in cotton wool.

If we now connect the ends of the strip with the poles of the battery, then current will flow along the strip, it will begin to heat up, and the paper layer will light up.

It burns out in a matter of seconds, so it is necessary that the strip touches the flammable material and he has time to grab.

If you have only regular foil, the method will work too, but it will take longer to wait until the heated foil sets fire to moss or cotton wool directly.

Electric affairs

The secret trick is very simple. When connecting the poles of the battery, a short circuit occurs; a metal foil (circuit) is repeatedly amplified current, from which the conductor is heated. In the narrowest place, that is, on the two-millimeter jumper, there is enough heating to heat the metal and set the paper layer on fire.

When doing this experiment at home, the upper part of the fleece, which touches the foil, should be carefully “fluffed” for better fire. Caution: the poles of the battery heat up during the experiment - you can get burned. In general, batteries are not a toy for children!

The article “Do not play with batteries” was published in the magazine Popular Mechanics (No. 6, June 2014).

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