Energy is power derived from the utilization of physical or chemical resources, especially to provide light and heat or to do work machines.
The law of conservation of energy states that the total energy of an isolated system remains constant.
Renewable energy sources are ones which don´t run out, which can be renewed, Non Renewable energy sources are ones which do run out, as we use them to generate energy, they get used up, and cannot be used a second time.
Kinetic energy is contained in a moving object, while potential energy exists in a stored form.
We use hydroelectric energy to make electricity out of dams.