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111Unit 4 Global Warming Period 1 Warming UpTeaching Goals:1. To arouse Ss interest in learning about global warming.2. To get Ss to know the energy source.Teaching procedures:Step 1. Leading-inPurpose: To activate Ss and arouse them to talk about global warming.T: Hello, everyone. Today we are going to read about global warming. But first lets think about what moves the world around .Yes, it is energy. But what is energy? Energy is a fundamental quantity that every physical system possesses; it allows us to predict how much work the system could be made to do, or how much heat it can produce or absorb .In the past, energy was discussed in terms of easily observable effects it has on the properties of objects or changes in state of various systems. Basically, if something changes, some sort of energy was involved in that change. Renewable energy sources like wind power dont emit carbon dioxide.Step 2 Warming upPurpose: To lead Ss to the topic of this unit.1. Pair workGet Ss to ask each other the following questions, and then ask them to present it before the class.(1) What is energy?(2) Where does it come from?(3) What energy sources are renewable?(4) What energy sources are non-renewable?2. Group work(1) Get Ss to talk about sources of energy according to the following photos. The above pictures can be used for Ss to talk about, and Ss can also talk as much as they can.By learning Warming Up we all know that energy is so important, but where does it come from?There are different forms of energy: Light energy光能Heat energy热能Sound energy声能Chemical energy source化学能源Nuclear energy核能Internal energy内能Kinetic energy动能Potential energy势能能源类型定义实例一次能源直接来自自然界而未经加工转换的能源化石燃料、太阳能、核能、生物燃料、水能等二次能源由一次能源直接或间接转化而来的能源电能、煤气、汽油、沼气、氢能等可再生能源不随其本身的转化或被人类利用而减少的能源太阳能、生物能、水能、风能、地热能等非再生能源随其本身的转化或被人类利用而减少的能源化石燃料、核燃料(2) Conclusion When energy changes from one form to another, the amount of energy stays the same. Energy cannot be made or destroyed. This fact is called “conservation of energy”. Matter can be made into energy through processes like nuclear fission and nuclear fusion.3. Competition: Take the quiz below and see whether Ss can fill in the blanks.Things thatuse energySources of energyRenewable/non-renewablelightsheatingtelevisioncassette playervideo recordercomputerfridgestovewashing machinehairdryercoal(1) _oil(2) _natural gas(3) _wind (wind power)(4) _sun (solar energy)(5) _uranium (nuclear energy)(6) _water (hydro-electric power)(7) _plant waste (biomass energy)(8) _hot springs or geysers(geothermal energy)(9) _the sea (tidal energy)(10) _Suggested Answers: (1) non-renewable; (2) non-renewable; (3) non-renewable; (4) renewable; (5) renewable (6) non-renewable; (7) renewable; (8) renewable; (9) renewable; (10) renewable4. HomeworkWrite a short composition about sources of energy.111
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