Produced by XuXiaoOu,Unit 16 Scientists at Work,Benjamin . Franklin,Do you know who I am ?,Benjamin . Franklin (1706-1790),printer diplomat（外交官)， statesman（政治家） philosopher（哲学家） inventor scientist,His great invention lightning rod（避雷针）, Why did he conduct the kite experiment ? Was the experiment done in June 1752 successful ?,He wanted to prove that lightning and electricity are the same.,Yes.,1.In 1752 scientists already knew what electricity was. 2.Franklin was helped by a friend to do the experiment. 3.Franklin made the kite of silk because wet silk does not conduct electricity. 4.A condenser was used in the experiment to store electricity. 5.The key tied to the string was put into the door to stop the kite flying away. 6.Franklins experiment was dangerous.,T,F,F,T,F,T,True or false,wooden sticks,silk ribbon,silk handkerchief,sharp metal,string,Materials,kite,key,instruction, Make a small cross of two pieces of light wood. Tie the corners of a handkerchief to the points of the cross. Add a tail to the frame. Tie a long string to the cross. Fix a sharp piece of metal to the top of the longer stick of the cross. Fasten a key to the end of the long string. Tie a silk ribbon to the string.,How to make a kite?,instructions,Make a small cross of two pieces of light wood. Tie the corners of a handkerchief to the points of the cross. Add a tail to the frame. Tie a long string to the cross. Fix a sharp piece of metal to the top of the longer stick of the cross. Fasten a key to the end of the long string. Tie a silk ribbon to the string.,How to make a kite?,make a small cross tie to add a tail to the frame tie a string to the cross fixsharp metal to fasten a key toend tie a silk ribbon to.,Describe the steps and draw a kite,get charged an electric shock hairsstand up,things we need,a kite,bad weather( thunderstorm),a key,a condenser,a shed,Retell Franklins famous kite experiment,What do you think of Benjamin Franklin?,Pros/ Cons : I think he is _, because before/during/ after the experiment, he _.,silly, great, wise,creative, adventurous, brave, bold（冒失的）, careful, serious,Discussion,Read the text and remember the words. Retell Franklins kite experiment. 3.Search more scientists and their famous experiments in the Internet. Share them!,Enjoy science!,Homework,See you,