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).
1 Carbohydrates are energy stores of animals and plants. 2  Carbohydrates are immediate source of energy while lipids are long-term source of energy. 3  Glucose is a free sugar which circulates in blood and is an important substance for normal cell functioning. 4  Regulation of glucose metabolism is vital for survival.