2006-09-12 22:26:35 · 13 answers · asked by shahan_najam 2 in Science & Mathematics ➔ Physics
Absolutely! Tim F is right. I know of at least one in Minnesota operated by Excel Energy.
2006-09-18 07:53:06 · answer #1 · answered by curious george 5 · 0⤊ 0⤋
DC was originally used in the US. But the huge line losses lead to the adoption of the AC standard.
Currently there are no large scale uses of DC transmission or supply.
2006-09-12 22:33:44 · answer #2 · answered by lovingdaddyof2 4 · 0⤊ 0⤋
Most of the answers are missing some key ideas. High voltage DC is indeed used for long distance power transmission. See http://en.wikipedia.org/wiki/Electric_power_transmission#HVDC for example.
While low-voltage of any sort is inefficient for long distances, HVDC is slightly more efficient than HVAC. For large power transmissions, it can be worth the extra cost (in both money and energy) to convert to DC at the start and back to AC at the end of the line.
2006-09-13 00:53:26 · answer #3 · answered by Tim F 2 · 0⤊ 0⤋
DC is found in low-voltage devices. Solar Power systems since the cells only produce a DC, also devices where they're powered by batteries for the same reason of only producing dc.
As technology progresses further to fuel cells the use of DC will increase further, as it only produces DC.
2006-09-12 22:45:21 · answer #4 · answered by Anonymous · 0⤊ 0⤋
I guess no because of the huge transmission losses. But who knows. I surely wouldnt want it to supply from LA to NY in DC
2006-09-12 22:31:22 · answer #5 · answered by Amrendra 3 · 0⤊ 0⤋
Definitely not! Besides having more power losses compare to that of AC, they do heat up the devices. And dangerous aswell. But we do make use of DC transmission lines for the Electirc Railways and Tram ways.
2006-09-12 22:38:35 · answer #6 · answered by Sikandar 2 · 0⤊ 0⤋
the cross channel link UK to france is DC to enable the syncronising of different grid frequencies.
DC cannot be easily transformed to higher or lower voltages, and low voltage transmission suffers from high losses.
Eddison produced DC for NY, and Tesla set-up caompeting company providing AC from Niagra falls - tesla understood what he was doing, Eddison was mostly a showman - eddison arranged for the first electric chair to use Tesla's ac, but the poor guy didn't get killed until they changed to dc
2006-09-12 22:41:11 · answer #7 · answered by fred 6 · 0⤊ 0⤋
ALL electronic/digital data is carried by Direct Current voltage in circuits and across transport telecommunications meduims, exceptions are Optical & Radio Frequency carrier. Not to mention ALL telephone service lines use -48VDC
2006-09-12 22:36:22 · answer #8 · answered by Anonymous · 0⤊ 0⤋
Probably, but only in really technologically isolate areas as DC suffers from huge loses when transmitted across distances.
2006-09-12 22:29:08 · answer #9 · answered by Anonymous · 0⤊ 0⤋
San Jose Light rail, BART, SF Muni just to name a few.
2006-09-12 22:35:50 · answer #10 · answered by Kainoa 5 · 0⤊ 0⤋