PDF《electrical, and chemical》

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4 to that source after it lights the bulb. Otherwise, it cannot light the bulb. 复习: 1.能量和功如何相关? 2.当科学家使用 功 这个名词时,是指什 么意思? 3.当你在推一面墙壁的时候,你有在做功 吗? 4.当一个物体震动的时候会产生什么形态的 能量? 5. 哪一种能量从太阳到地球? Review: 1. How are energy and work related? 2. What do scientists mean when they use the term work? 3. Are you working when you push a wall? 4. What form of energy does an object create when it vibrates? 5. What is one type of energy that reaches Earth from the Sun? Draft -4_30_2010 ALBETAC Science Bilingual Study Notes Gr.

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5 第二单元:能量 Unit 2: Energy 关键问题: 有哪些方法能量可以从一种形态转变到另一种形 态? Essential Question: What are some ways that energy can be changed from one form to another? 2.2 主要观念 辨认能量转变的凭证和人类如何利用这些能 量的转变:热到光,化学到电,电到声音, 等等. Key Idea 2.2: Identify the evidence for energy transformations and how humans use these energy transformations: heat to light, chemical to electrical, electrical to sound, etc. 科学用语: 1. 有机体 2. 转变 Scientific Terms: 1. living organism 2. transformation 内容: 第一个利用来自太阳的光能的有机体是植物.植 物将来自太阳的光能转变成食物,其中储存著化 学能.当动物和人类吃了植物以后,他们将储存 的化学能转变为热能让自己保持温暖,和机械能 可以让自己移动.当植物的部位为木头或乾的树 叶,燃烧以后,它们储存的化学能便转变为热 能. 当煤炭燃烧,它储存的化学能转变为热能.然后 热能也许转变为机械能,转动机器并产生电能. 电能可以转变成光,声音,热,或者机械能.它 可以让一盏灯,一个门铃,一个电热板,或一个 搅拌器运作.机械能也可以转变为声音.例如, 你敲击一个钢琴键,便会到一个乐音. 其他能量的转变和人类如何利用能量转变的例子 有:当我们点亮一根火柴,储存在火柴棒的化学 能燃烧并转变为光能和热能.当我们使用一个搅 拌器,电能转移成机械能.当太阳照射到我们, 能量从光能转变为热能. Content: The first living organisms to use light energy from the Sun were plants. Plants change light energy from the Sun to food, which is stored chemical energy. When animals and people eat a plant, they change its stored chemical energy to heat to stay warm and to mechanical energy to move. When plant parts such as wood or dry leaves are burned, their stored chemical energy is changed to ........