The renewable and non-renewable sources of energy are used primarily for generating two types of energy: electricity and heat. The non-renewable sources of energy such as, coal and natural gas undergo combustion to produce energy. These carbon-based fossil fuels, when burned in presence of oxygen, release gases and heat. This heat energy can be used directly as a source of heat, as many people in developing or underdeveloped countries do to stay warm (using wood or coal based devices). The heat can also be used to convert water to steam, which can then turn a turbine, which will be used to run a generator to produce electricity. Renewable energy sources have different mechanisms for energy production. Wind turbines, for example, rotate depending on wind direction and speed. This motion is used to generate electricity. Solar cells convert solar energy into electricity using photovoltaic effect. They can also be used to generate heat by concentrating solar energy using reflectors.
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