rod(避雷针).ppt

* * Do you know? He was born on January 17, in Boston in Masachusetts, and was the tenth child and youngest son of the family. His father was a candle maker. When he was young, he was not very good at math. He was curious and loved to learn about new things but he had only less than three years of formal education. He invented lightning rod.(避雷针) He helped set up America’s first city hospital. He also helped to found a new nation. He helped to write the Declaration of Independence. He was a successful businessman, an inventor, a writer, a scientist and a world-famous statesman. The key tied to the string was put into the door to stop the kite from flying away. A condenser was used in the experiment to store electricity. Franklin made the kite of silk because wet silk does not conduct electricity. Franklin was helped by a friend to do the experiment. In 1752 scientists already knew what electricity was. After reading Topic Before reading T F F T T After reading the text did you find out what this experiment prove? The experiment proved that lightning and electricity were the same. Franklin’s famous kite experiment Time: People: weather purpose The things needed The steps: June 1752 Franklin and his son Thunderstorm, rainy day To prove lightning and electricity are the same A kite, a key, some bad weather, a condenser First …… Second …… Third ……