[LINK] A Clean Energy Revolution -- Now
hamish at cloud.net.au
Sun Sep 22 22:59:28 AEST 2013
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  and Westinghouse Electric based in Pittsburgh, Pennsylvania.
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.
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