Conductor
Electricity is the most powerful and heavily demanded mode of energy for all human beings in this world. According to the law of conservation of Energy states that "Energy can neither be created nor be destroyed, it can only be changed from one form to another",So to achieve this typical energy format we have to convert from other energy variants.There are many modes conversion of energy to electricity. Hydro, geothermal, nuclear, wind, waves, etc are some among them. After conversion the stage before utilization is to transfer power. So to fulfill this, a medium for transferring power has to be discovered. We could define electricity as the study of flow of charge/electrons. So fundamental property of the medium used for transfer of power should strongly support the flow of electrons. It was Stephen Grey , who noticed that the the cork (at the end of his glass tube which kept moist air and dust out) has developed an attractive force