Origin of the name Helena: Cognate of the Greek HelenÄ, which is derived from the root ÄlÄ (light, torch, bright). The name is borne in Greek legend by the beautiful wife of the king of Sparta.Her abduction by the Trojan prince Paris sparked off the Trojan War. From A World of Baby Names by Teresa Norman.ognate of the Greek HelenÄ, which is derived from the root ÄlÄ (light, torch, bright). The name is borne in Greek legend by the beautiful wife of the king of Sparta. Her abduction by the Trojan prince Paris sparked off the Trojan War. From A World of Baby Names by Teresa Norman.
The motion of the wind and water, as well as the motion of the wheel or shaft, represents a form of mechanical energy. The source of animal power is ultimately the chemical energy contained in foods and released when digested by humans and animals.The chemical energy contained in wood and other combustible fuels has served since the beginning of history as a source of heat for cooking and warmth.n early source of energy, or prime mover, used by humans was animal power, i.e., the energy obtained from domesticated animals. Later, as civilization developed, wind power was harnessed to drive ships and turn windmills, and streams and rivers were diverted to turn water wheels (see water power).
The sun is the main source of electric energy, trough fossil fuels, wind turbines, hydroelectric plants, solar panels, and more. The only electrical energy we use that does not ultimately come from the sun is that generated in a nuclear power plant. Written Mar 29 Â· View Upvotes.