|Tobacco seedlings, about 3 weeks old|
In very basic terms, it works like this: When a substance is heated unevenly, so that there is a difference of at least 60 degrees in temperature between one end of it and the other, an electric current is created. A denser material or greater temperature difference will cause a stronger current.
According to Collier's Encyclopaedia, thermoelectric systems are used on the moon, where the extreme temperatures make them very efficient. On a more everyday level: in the 1950's, small units were distributed to people living in remote Siberia so that they could use the heat from their kerosene lamps to run their radios.
It's really free electricity. I bet my cookstove could run a lightbulb and a radio through the winter if I had the knowledge to build a little generator. Too bad the makers of that fan wouldn't produce something slightly more powerful and more useful.
|Dulsa still likes to lie in a basket|