Soldering gun
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A soldering gun is in effect a transformer. The secondary winding has very few turns of heavy copper wire or bar, and generates a high current at a very low voltage. The bit is made of thinner copper wire, and so has a relatively high resistance. This causes the bit to heat up. one of the advantages of soldering guns is that they only take only a few seconds to heat up, and also cool down rapidly after being switched off. They are also powerful, making them ideal for tasks such as soldering together small metal sheets and tubes. They typically produce from 50-200 W of heat. One disadvantage is the heat regulation is not very good; also the large bit is rather clumsy making it unsuitable for detailed work (i.e. electronic circuits).
See also
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