2. 1732, American scientist Benjamin Franklin (1706 ~ 1790) thought that electricity is a weightless fluid and exists in all objects. When an object gets more electricity than normal, it is called positively charged; If it is less than a positive constant, it is called negative charge. The so-called "discharge" is the process from positive current to negative charge (artificially specified). This theory is not entirely correct, but the names positive charge and negative charge have been preserved. The concept of "electricity" in this period is a material proposition.
3. 1752, Franklin put forward the kite experiment. In the experiment, other scientists put kites with keys into the clouds, and the metal wires wet by rain led to lightning in the air between their fingers and keys, which proved that lightning in the air was the same as electricity on the ground. Later, according to this principle, he invented the lightning rod.
Franklin made others do many experiments, which further revealed the nature of electricity and put forward the term current. Franklin's other great contribution to electricity was to design the famous kite experiment "Catch the electricity in the sky" by 1752, which proved that lightning in the sky and electricity on the ground are the same thing.
Extended data:
1, the electrical effect in matter is the link between electricity and other physical disciplines (even non-physical disciplines). There are many kinds of electrical effects in matter, many of which have become or are gradually developing into specialized research fields.
2. The discovery and application of electricity has greatly saved human physical and mental work, made human strength grow wings and extended human information tentacles. The influence of electricity on human life has two aspects: the acquisition, conversion and transmission of energy and the basis of electronic information technology.
The discovery of electricity can be said to be a revolution in human history. The kinetic energy it produces is constantly released every day. The demand for electricity is exaggerated, saying that its function is no less than oxygen in the human world. Without electricity, human civilization will still explore in the dark.
References:
Baidu encyclopedia-electricity