Energy is Ability to do work. The energy can take a wide variety of forms - heat (thermal), light (radiant), mechanical, electrical, chemical, and nuclear energy. There are two types of energy - stored (potential) energy and working (kinetic) energy.  For example, the food you eat contains chemical energy, and your body stores this energy until you release it when you work or play ... more
                 
 
Sources of energy
We get most of our energy from nonrenewable energy sources, which include the fossil fuels - oil, natural gas, and coal.  They're called fossil fuels because they were formed over millions and millions of years by the action of heat from the Earth's core and pressure from rock and soil on the remains (or "fossils") of dead plants and animals.  Another nonrenewable energy source is the element uranium, whose atoms we split (through a process called nuclear fission) to create heat and ultimately electricity.
Oil (Petroleum)
Oil was formed from the remains of animals and plants that lived millions of years ago in a marine (water) environment before ... more
 
Coal
The route from the coal mine to the places where it is used can take many paths. Most coal is transported by train and barge ... more
 
Electricity
Electricity is the flow of electrical power or charge. It is a secondary energy source which means that we get it from the conversion of other sources of energy ... more
   
Natural gas
Millions of years ago, the remains of plants and animals decayed and built up in thick layers. This decayed matter from plants and animals is called organic ... more
 
Uranium (nuclear)
A nuclear power plant operates basically the same way as a fossil fuel plant, with one difference: the source of heat. The process ... more
 
Hydrogen
Hydrogen is the simplest element known to man. Each atom of hydrogen has only one proton and one electron. It is also the most plentiful gas in the universe ... more
 
 
 
 

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