1 情景导入:
What’s this ? What’s in the house ? Let’s open the door . Can you see anything ? What does he need ?
(通过创设有效情景,逐层揭示并实现目标)
2 认识电池
1) 认识其正负极(anode , cathode )
2) 出示4张图片,学生根据图片内容,练习说Don’t ……
3)认识battery , holder , wires , bulb
4) What’s in the bulb ?
认识钨丝filament ---让学生看有关爱迪生的照片及简要描述其成就的一个短篇
问题: Who is the inventor of the bulb ?
Conclusion : We should learn ……
3 一学生展示如何使电灯泡发亮
学生练习做
生生汇报(How to connect ? )
辨别是非(Make a judgment ) 图片出示连接方法,学生判断正误,不当方法并说出理由。
小组练习做
全班展示
问题讨论:Which part of the bulb is light ?
How does the electricity flow ?
实验一
实验二
If I give you two bulbs , two wires and one battery , can you make them too ?
实验三
Genius is too happy today . He learned a lot with you . The Spring Festival is coming . Would you please decorate the classroom now ? Make all the bulbs light . Let’s have a party .
《Battery》课堂教学实录
1 看卡通片 (一木偶在拉二胡)
What can you see ? ( a boy )
What’s his name ? (学生猜)
Say “ hello “ to Ben .
What can he do ?
Let’s invite Ben to play erhu again . (木偶没有反应)
What’s the matter with the toy ?
2 分步研究
1) 打开木偶底部,找出原因:no battery
认识各种电池,认识各种形状的电池, 什么东西需要电池工作,手电筒、钟等需要多少电池
练习:How many batteries each one need ?
Devices
Battery / batteries
Camera
4
torch
2
Toy car
6
……
……
不同的东西需要不同数量的电池来工作
2)放入3个电池在木偶中,再次邀请Ben来演奏,又不行,得出第二个不行的理由:put in wrongly
认识正负极
3) 放入电池,又邀请,不行。理由:run out
Ben can play the erhu .
3 拓展延伸
1) How do we deal with the old battery ?
出示四副图片,讨论,得出结论
P1 : cu t the batteries Ss : Don’t cut the batteries .
P2 : eat the batteries Ss : Don’t eat the batteries .
P3 play with batteries Ss : Don’t play with batteries .
P4 : throw them into the river Ss : Don’t throw them into the river .
2 ) 出示两张污染环境的图片 (生看图说话)
3) What can we do to deal with the old batteries ?
学生看一些宣传资料图片
4 ) 课外延伸:小组讨论或和家长课后讨论,如何放置旧电池?