Scientists define energy as the ability to do work. Modern civilization is possible because people have learned how to change energy from one form to another and then use it to do work.

Electricity is the set of physical phenomena associated with the presence and motion of matter possessing an electric charge. Electricity is related to magnetism, both being part of the phenomenon of electromagnetism, as described by Maxwell's equations. Common phenomena are related to electricity, including lightning, static electricity, electric heating, electric discharges and many others.

Energy comes in various forms—from sonic and gravitational to nuclear and thermal. Understanding these diverse forms of energy helps us comprehend the forces that fuel our natural world and day-to-day activities, from charging our cell phones to powering our homes.

Renewable Energy, also called Alternative energy is any energy source that is an alternative to fossil fuel. These alternatives are intended to address concerns about fossil fuels, such as its high carbon dioxide emissions, an important factor in global warming. Marine energy, hydroelectric, wind, geothermal and solar power are all alternative sources of energy.

The Sun is he star around which the earth moves and that provides light and heat for the earth: The sun is the center of our solar system. Sun also means the light or heat that the earth receives from this star: Sit in the sun where it's a lot warmer. sun.

Science is the intellectual and practical activity encompassing the systematic study of the structure and behaviour of the physical and natural world through observation and experiment.