Unit 4 《Global Warming 》教案43（新人教版選修6）

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111 Unit 4 Global Warming Period 1 Warming Up Teaching 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-in Purpose: 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 let’s 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 don’t emit carbon dioxide. Step 2 Warming up Purpose: To lead Ss to the topic of this unit. 1. Pair work Get 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 熱能 Sound energy 聲能 Chemical energy source 化學(xué)能源 Nuclear energy 核能 Internal energy 內(nèi)能 Kinetic energy 動(dòng)能 Potential energy 勢能 能源類型 定義 實(shí)例 一次能源 直接來自自然界而未經(jīng)加工轉(zhuǎn)換的能源 化石燃料、太陽能、核能、生物燃料、水能等 二次能源 由一次能源直接或間接轉(zhuǎn)化而來的能源 電能、煤氣、汽油、沼氣、氫能等 可再生能源 不隨其本身的轉(zhuǎn)化或被人類利用而減少的能源 太陽能、生物能、水能、風(fēng)能、地?zé)崮艿? 非再生能源 隨其本身的轉(zhuǎn)化或被人類利用而減少的能源 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 that use energy Sources of energy Renewable/non-renewable lights heating television cassette player video recorder computer fridge stove washing machine hairdryer coal (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) renewable 4. Homework Write a short composition about sources of energy. 111