Alternative sources of energy

Eliška DlouháV8A

Alternative sources of energy

• reduce our dependance on fossil fuels• renewable • environmental friendly• no pollution

Solar energy

• ineffective - only 30%• passive - duration, position, sun’s rays intensity• active - electrical technology

- solar panels • no pollution, no care• ineffective in colder regions

Wind energy

• windmill• family energy needs, industrial uses (wind farms)• no air pollution• low cost• windy areas• noisy• kill birds

Hydroelectric energy

• largest producer • dams, water mills• constant, predictable, controllable• no greenhouse gases• huge costs to build• prevent the migration of fish• tidal power

Geothermal energy

• from beneath the earth• magma → heat → boil water → steam → turns the turbines• no pollution, effective• suitable for particular region • harmful gases • huge installation cost

Summary

• solar energy• wind energy• hydroelectric energy• geothermal energy• biomass energy• hydrogen• every source suitable for different area

Sources

• http://www.conserve-energy-future.com/AlternativeEnergySources.php, 23. 2. 2015

• http://www.altenergy.org/, 23. 2. 2015

• http://en.wikipedia.org/wiki/Renewable_energy, 23. 2. 2015

• http://saveenergy.about.com/od/alternativeenergysources/a/altenergysource.htm, 23. 2. 2015