Although knowledge about the existence of electricity existed as early as 600 B.C., it was not until 1600 that William Gilbert published "De magnete, Magneticisique Corporibus," or "On the Magnet" and coined the term "electrica." Before Gilbert, knowledge was limited to that of the magnetic charges of a loadstone and that rubbing an amber or a jet rod with wool caused particles to stick to the rod.Know More
Gilbert's publication inspired other European inventors to work with electricity. The Leyden jar allowed scientists to store static electric charges in a type of capacitor. The stored charge was significant enough that it knocked its inventor, Ewald Christian Von Kleist, to the floor when he initially touched it.
Benjamin Franklin discovered that lightning and electricity were the same phenomenon, which led to the invention of the lightning rod and the first practical use of the growing knowledge about electricity. Alessandro Volta built the first electric pile, a forerunner of the battery, which allowed scientists to conduct simple electrical current experiments. In 1819, Hans Christian Oersted discovered electromagnetic fields. His work led to Michael Faraday's invention of the first crude electrical motor in 1921 and the first generator 10 years later. The first electrical power stations were built approximately 50 years later.Learn more about Electricity
Electricity, the flow of electric charge, powers much of the technology used in modern society. The Energy Information Administration explains that electricity is a secondary source of energy, meaning that it comes from the conversion of other energy sources.Full Answer >
The abbreviation "mA" denotes the International System unit for electrical current known as the milliampere. One milliampere is equal to one-thousandth of an ampere. The unit is named for the 18th and 19th century French physicist Andre-Marie Ampere, who studied electromagnetism.Full Answer >
People have known of the existence of sulfur since ancient times, with the earliest written record dating back to Assyrian texts from around 700 to 600 B.C. Additional mentions are found in the poetry of Homer from the ninth century B.C.Full Answer >
Calculating electric field intensity requires the knowledge about the current charge level of the object that is making the electric field and the distance between that charged object and the measuring tool. Electric field intensity (or strength) is a vector quantity, which means it has direction as well as magnitude. The magnitude of this intensity comes from the way it is measured.Full Answer >