The DC motor was the mainstay of electric traction drives on both electric and diesel-electric locomotives, street-cars/trams and diesel electric drilling rigs for many years. The introduction of DC motors and an electrical grid system to run machinery starting in the 1870s started a new second Industrial Revolution.
One acre is 43,560 sq ft. One half acre is 21,780 sq ft. However, that doesn't help most people much when trying to picture how large a lot is. Half acre lot is roughly:
There are 43,560 square feet in one acre.   An acre is a unit of area. 640 acres equal a square mile. Hence, it is 1/640 of a square mile. Since a square mile contains 2 â¦ 7,878,400 square feet, an acre is 27,878,400 divided by 640, which is 43,560 square feet.Remember: an acre can be converted to SQUARE feet, not plain (linear) feet. Square feet and feet are not the same units. A foot is unit of distance.an you tell me how many square feet are in one acre?     Answer     43,560 ft in an acre     in one Acre there is 43560.40 sq feet for more conversions visit links below in the link section 1 acre = 43,56 â¦ 0 square feet.