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Wikipedia: In alternating current (AC, also ac) the movement of electric charge periodically reverses direction. In direct current (DC), the flow of electric charge is only in one direction. AC is the form in which electric power is delivered to businesses and residences.
![[Usually hidden from the unaided eye, the blinking of lighting powered by AC mains is revealed in this motion]](http://images.ookaboo.com/photo/s/City_lights_in_motion_s.jpg "Usually hidden from the unaided eye, the blinking of lighting powered by AC mains is revealed in this motion")
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![[High voltage transmission lines deliver power from electric generation plants over long distances using...]](http://images.ookaboo.com/photo/s/Highvoltagetransmissionlines_s.jpg "High voltage transmission lines deliver power from electric generation plants over long distances using...")
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 from RadRafe |
 from Staplegunther |
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