Understanding Energy

Why after work, thinking and exercising gradually became hungry, thirsty and tired? What do you do if you are hungry and thirsty? with eating and drinking mean that you have replaced the power you have used.
In everyday life, power is often called energy. Jadai energy is the ability to do work.
  Energy is not only owned living beings, but also possessed by inanimate objects such as solar, wind, waterfalls, coal, petroleum, and others. Try to mention other examples?.
The water trapped behind the dam have the energy that can be used to rotate the paddle wheel. Wind also has energy, wind can play wind or pushed kincior sailboat. Damage caused by ocean waves, it also shows that the wave energy.