The lightning rod invented by Franklin is the most representative. Lightning rod is a lightning protection device. Usually, a lightning rod consists of three parts: a metal rod with a sharp upper end, and the lower end of the metal rod is connected with a conductor, and the conductor is buried together in an underground metal plate. Lightning rod is made according to the principle of tip discharge. When the conductor is charged, the electric field near the tip is particularly strong, which ionizes the nearby gas and leads to discharge.
Introduction to Franklin
Benjamin Franklin (English:170665438+1October17-65438+April 0790 17), an American politician, scientist, printer and publisher, writer, inventor and diplomat, was the founding father of the United States. Franklin engaged in newspaper activities in his early years. 173 1 year, the first mobile library in North America was established in Philadelphia. 1743, he organized the American Philosophical Society and later helped to establish the University of Pennsylvania.
The United States participated in the anti-British struggle during the War of Independence, was elected as the representative of the Second Continental Congress, and participated in the drafting of the Declaration of Independence. He went to France from 1776 to 1785, which contributed to the establishment of the American-French alliance. He also negotiated with Britain on behalf of the United States, and signed the Paris Peace Treaty in 1783, which made Britain recognize the independence of the United States. 1787 was a representative of the Constitutional Convention, participated in drafting the American Constitution, and advocated the abolition of slavery.