Energy_sources_能源简介英文资料.pptVIP

Energy sources 王逸 茅以升4班 primary energy resources Primary energy?is an energy form found in nature that has not been subjected to any conversion or transformation process. Such as Fossil fuels energy Oil? Coal? natural gas Wind energy Solar energy Geothermal energy secondary energy resources Secondary energy refers to the more convenient forms of energy which are transformed from other, primary, energy sources through energy conversion processes. The two most well-known energy carriers are: Electricity Hydrogen They are usually Renewable sources Wind energy Wind power Wind power harnesses the power of the wind to propel the blades of?wind turbines. These turbines cause the rotation of magnets, which creates electricity. Wind towers are usually built together on?wind farms.? hydro energy hydro energy In hydro energy, the?gravitational?descent of a river is compressed from a long run to a single location with a?dam?or a flume. Solar energy Solar power Solar power involves using?solar cells?to convert?sunlight?into?electricity, using sunlight hitting solar thermal panels to convert sunlight to heat water or air, using sunlight hitting a?parabolic mirror?to heat water (producing?steam), or using sunlight entering windows for?passive solar?heating of a building. Geothermal energy Geothermal energy Geothermal energy harnesses the heat energy present underneath the?Earth, and is capable of supplying all of our energy. Fossil fuels energy Fossil fuels Fossil fuels?are?fuels?formed by natural processes such as?anaerobic decomposition?of buried dead?organisms. Such as oil , coal and natural gas secondary energy resources Electricity Electricity Electricity grids are the?networks?used to?transmit?and?distribute?power?from production source to end user, when the two may be hundreds of kilometres away. Battery Batteries are used to store energy in a chemical form. As an alternative energy, batteries can be used to store energy in?battery electric vehicles. Hydroge