Renewable Energy

Contents

What is renewable energy? Solar energy Wind energy Tidal energy Hydroelectric energy Biomass Geothermal energy END SHOW !

What is Renewable Energy?

Renewable energy is a socially and politically defined category of energy sources. Renewable energy is generally defined as energy that comes from resources which are continually replenished on a human timescale such as sunlight, wind, rain, tides, waves and geothermal heat.

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Solar energy

Solar energy means energy from the sun. We can capture some of the sun’s energy and use it to heat buildings , provide light and generate electricity.

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Wind energy

Humans have used wind energy to power machinery in windmills for hundreds of years. Today, electricity companies are building wind farms which use giant machines called wind turbines to make electricity for homes , schools and factories.

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Tidal energy

Everyday the tide at the seaside goes in and out – twice. This rising and falling of the sea is caused by the pull of the moon. We can use this powerful flow of water to generate electricity.

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Hydroelectric energy

Hydro-energy means energy from moving water. It is one of the oldest forms of power. Watermills have been used to grind corn for hundreds of years. Today, electricity can be generated by building dams, which force water to turn machinery.

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Biomass

Biomass is a renewable energy source because the energy it contains comes from the sun. Through the process of photosynthesis in plants captures the sun's energy by converting carbon dioxide from the air and water from the ground into carbohydrates. When these carbohydrates are burned, they turn back into carbon dioxide and water and release the sun's energy they contain. In this way, biomass functions as a sort of natural battery for storing solar energy. As long as biomass is produced sustainably—with only as much used as is grown—the battery will last indefinitely.

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Geothermal energy

Coal miners know that the deeper you dig the hotter it gets. This is because of the heat at the earths core. We call the earths natural heat geothermal energy. This can be used to heat buildings or generate electricity.

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END SHOW

We hope you have enjoyed our power point and learnt more about RENEWABLE ENERGY!!!!!!!