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1、人教课标人教课标人教课标人教课标版版版版 高二选修高二选修高二选修高二选修6 6Unit 4Unit 4Warming upListThings that use energySources of energyRenewable / non-renewable Fossil fuel ( (化石燃料化石燃料) ): Ancient animal and plant material below the surface of the earth with a high carbon content, such as coal, oil and natural gas, which can be
2、burnt to produce energy. Also known as non-renewable energy because once they are used they have gone forever; they cannot be renewed. From the following pictures, you will know where all this energy comes from.windmillsa coal power stationan oil refinerya nuclear power plantsolar panelshydro-electr
3、ic damSample listsThings that use energySources of energyRenewable / non-renewablelightheatingcoalnon-renewableoilnon-renewabletelevision cassette player video recordercomputernatural gasnon-renewable wind (wind power)renewable sun (solar energy)renewable uranium (nuclear energy)non-renewablefridges
4、tovewashing machinehairdryerwater (hydro-electric)renewableplant waste (biomass energy)renewablehot springs or geysers (geothermal energy)renewablethe sea (tidal energy)renewableRenewable or non-renewable?Renewable or non-renewable?Renewable EnergyRenewable energy sources, such as the sun, wind, rai
5、n, and plant matter, naturally and continually “renew” themselves. These renewable energy sources are:Biomass - organic (plant, animal) materials oGeothermal - the heat of the earth oHydroelectric - energy from flowing or falling water (streams, dams)Ocean energy - from waves, tides, or temperature
6、differences in the ocean oSolar - from the sun (two types of systems: solar thermal and photovoltaic) oWind - from the windWhat is told in the picture?non-renewable energy source Notes to Renewable energy Renewable energy resources may be used directly, or used to create other more convenient forms
7、of energy. Examples of direct use are solar ovens, geothermal (地温地温) heating, and water and windmills. Examples of indirect use which require energy harvesting are electricity generation through wind turbines (涡涡轮轮) or photovoltaic (光电的光电的) cells, or production of fuels such as ethanol (酒酒精精) from b
8、iomass (生物量生物量). Renewable energy (sources) or RES capture their energy from existing flows of energy, from on-going natural processes, such as sunshine, wind, flowing water, biological processes, and geothermal heat flows. Most renewable energy, other than geothermal and tidal power, ultimately (基本
9、上基本上) come from the Sun. Some forms are stored solar energy such as rainfall and wind power which are considered short-term solar-energy storage, whereas the energy in biomass (生物生物量量) is accumulated (积聚积聚) over a period of months, as in straw, or through many years as in wood. Capturing renewable e
10、nergy by plants, animals and humans does not permanently deplete (耗尽耗尽) the resource. Fossil fuels, while theoretically renewable on a very long time-scale, are exploited at rates that may deplete these resources in the near future.1. Review the new words and expressions you learned in this class.2. Preview Reading.Homework
