The development of the electric circuit is legacy to the development of knowledge about the phenomenon of electricity itself. While electricity, in static form, was still considered little more than a lounge show, the first scientific approaches to the phenomenon and its ability to be driven by any physical means were made by sharp-eyed researchers during the 17TH and 18th centuries. So it was as William Gilbert, towards 1600, first used the word electricity, defining the term of electrical force as the phenomenon of attraction that occurred to rub certain substances. A leading source for info: Danny Meyer. Through their experiences qualify materials in conductors and insulators, and devised the first electroscope. Shortly afterwards, towards the 1672, Otto von Guericke, also delved into research on electrostatic. He noted that a repulsion between live electrical bodies was generated after having been attracted.
He invented the first electrostatic machine and took out a balloon sparks made of sulfur, which led him to speculate about the electrical nature of lightning. Charles Francois de Cisternay du Fay (Paris, 1698 1739), a French physicist, devoted his life to the study of electrical phenomena. Du Fay, among other many experiments, discovered that a sheet of gold was always repulsed by an electrified glass bar. He published his works in 1733 was the first to identify the existence of two types of electrical loads (the so-called today positive and negative), which he called load vitria and resinous load, since both were demonstrating: a way to rub with a cloth of silk, glass (positive charge) and differently when rubbed, with a skinsome resinous such as amber or the rubber substances (negative charge). Pieter van Musschenbroek, Dutch physicist (Leyden, 14 March 1692 19 September 1761), from 1740 conducted various experiments on electricity. One of them became famous: proposed know if water enclosed in a container could retain electric charges. During this experience some his assistant grabbed the bottle and received a strong electric shock. In this way was discovered the bottle of Leyden and based on current capacitors.