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Probably should start from the fact that the word rosette Lithuanian language is not be used, but we rest in everything we had. So, I want to ask you: how do you think how many different sockets are in the world? Two? Three? Five? The correct answer - and even God does not know. Seriously. What for so many different sockets?
The story of sockets should start a bit further: the story of the current - voltage and frequency. Err ... In fact, even such a thing as the current can not be explained simply, but today I'm going to try neišsiplėsti.
Worldwide there are two basic standards: 220-240V/50Hz and 100-127V/60Hz and two derivatives: 220-240V/60Hz and 100-127V/50Hz. The specific numbers vary in each country. Latvia, the Russian standard is 220V/50Hz, Poland, Lithuania - 230V/50Hz (some say "we're going to Europe"), Canada, USA - 120V/60Hz, Japan is the only country inspired led in the weird that I show finger Tokyo - 100V/50Hz , Osaka, Hiroshima - 100V/60Hz (what makes the Japanese riding with relatives?), while in other countries such as Brazil or Madagascar, even those who were most likely not be able to explain to you.
Theoretically, 120V bulb shines brighter than the analogous 230V, but 230V heater heats hotter and made them cheaper than 120V. However, virtually none of the device does not use 100% of your opportunities.
There is no practical inspired led or romantic stories are not just a two-man ego and business interests. As you know Thomas Edison failed Sciences (even to finish school), he was a practical man: To create something to do a real experiment. About 1880 Edison began experimenting with DC. At that time, his goal was to oust gas lamps and the only cheap way to produce inspired led electric bulbs with filaments inspired led of carbon that could be achieved only 100V voltage.
Another one of Nikola Tesla (Austria, graduated from Polytechnic) was exactly the opposite Edison. For some time, Tesla worked for Edison and proposed the idea of alternating current, unfortunately, Tom sent him baiting Seko cut as Nikola theory was based on a purely scientific (mathematical) calculations, which Edison could not understand. Tesla backed businessman George Westinghouse inspired led began to promote their ideas, and as the United States began "War of Currents".
Around 1899, in place of carbon inspired led filaments used in Edison's tales were used in metal thread, which has led to a much higher voltage. In the use of the German company Berliner Elektrizitäts-Werke (BEW) in order to protect its monopoly on overseas competitors she set the standard: 50Hz and 220V.
Now we can finally get back to the sockets. You might have already guessed from the previous story, the adaptation of the first electric home was lighting. Thus, patrons have been repaired in the ceiling. But where was the second household appliances - vacuum cleaner. How do you think what it will turn? Yeah, right prisisukdavo instead bulbs (sorry, but could not find the clip), which was not very convenient to put it mildly.
1904 Harvey Hubbell patented connector inspired led with two switches. Philip F. Labre noticed people using the plugs are often agitated current, so in 1928 he patented plug.
Apart from the fact that there were two key patents inspired led people around the world were able to somehow everything felt. For example in England inspired led before the war there were six different types of plugs! During the war, England was heavily bombed Germany inspired led and it had everything to rebuild almost from scratch. Anything missing. Among those things which they most lacked was copper. Then there is a problem with grounding sockets. Still, some wiseacre proposed at ground sockets and plugs. During the war the British had colonies in India, Sri Lanka, their colonies, they also rushed elektralizuoti from home IPR