Electrical Power
With the widespread establishment of power grids, power transmission is usually associated most with electric power transmission. Alternating current is normally preferred as its voltage may be easily stepped up by a transformer in order to minimize resistive loss in the conductors used to transmit power over great distances; another set of transformers is required to step it back down to safer or more usable voltage levels at destination.
Power transmission is usually performed with overhead lines as this is the most economical way to do so. Underground transmission by high voltage cables is chosen in crowded urban areas and in high-voltage direct-current (HVDC) submarine connections.
Read more about this topic: Power Transmission
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