On 22/09/13 15:57, Marghanita da Cruz wrote: > Hi Stephen, > > My 2c worth is there are a few things about the article and I think we need > to question some of the assumptions around electricity. There are a lot of > DC appliances around, mainly aimed at the Carvan market, but then the > Laptop and other mobile devices lead to energy efficiencies in Computrers. > AC Wiring for Lighting is no longer a given. > >> In the War of Currents era (sometimes, War of the Currents or Battle of >> Currents) in the late 1880s, George Westinghouse and Thomas Edison became >> adversaries due to Edison's promotion of direct current (DC) for electric >> power distribution over alternating current (AC) advocated by several >> European companies [1] and Westinghouse Electric based in Pittsburgh, >> Pennsylvania. > http://en.wikipedia.org/wiki/War_of_Currents
Two fundamentals haven't changed though; 1. Transmission losses are proportional to current (P=I*I*R), and higher voltage means lower current (P=V*I, P is constant); 2. It's a lot easier (cheaper, more efficient) to step between voltages with AC than DC. Hamish _______________________________________________ Link mailing list [email protected] http://mailman.anu.edu.au/mailman/listinfo/link
