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An electroscope can only give a rough indication of the quantity of charge; an instrument that measures electric charge quantitatively is called an electrometer. The electroscope was the first electrical measuring instrument. The first electroscope was a pivoted needle (called the versorium), invented by British physician William Gilbert around ...
A gold-leaf electroscope (E), a sensitive detector of electric charge, is attached by a wire to the outside of the pail. When the charged ball is lowered into the pail without touching it, the electroscope registers a charge, indicating that the ball induces charge in the metal container by electrostatic induction. An opposite charge is induced ...
A somewhat similar system called "concentric wiring" was introduced in the United States around 1905. In this system, an insulated electrical wire was wrapped with copper tape which was then soldered, forming the grounded (return) conductor of the wiring system. The bare metal sheath, at earth potential, was considered safe to touch.
electrical cable A flexible conducting wire to carry electrical power or signals, usually covered with an insulating material. electrical code A set of regulations for the use of electricity; they may vary from municipal to international in scope. electrical conductivity A measure of a substance's ability to pass an electric current. electrical ...
In some applications wire sizes are specified as the cross sectional area of the wire, usually in mm 2. Advantages of this system include the ability to readily calculate the physical dimensions or weight of wire, ability to take account of non-circular wire, and ease of calculation of electrical properties.
In the same year, he also invented an electroscope. [14] In 1750 Nollet was the first to report a phenomenon that is known today as electrostatic spraying. [15] He noted that water flowing from a vessel would aerosolize if the vessel was electrified and placed near electrical ground.
An electrometer is an electrical instrument for measuring electric charge or electrical potential difference. [1] There are many different types, ranging from historical handmade mechanical instruments to high-precision electronic devices.
Wire bonding is the application of microscopic wires for making electrical connections inside semiconductor components and integrated circuits. Magnet wire is solid wire, usually copper , which, to allow closer winding when making electromagnetic coils , is insulated only with varnish, rather than the thicker plastic or other insulation ...
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