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# Wire cross-section, current strength, power and load characteristics

Electricity - a set of phenomena caused by the existence, interaction and movement of electric charges. The term was introduced by the English naturalist William Gilbert in his work “On a magnet, magnetic bodies and a large magnet - the Earth” (1600), which explains the action of the magnetic compass and describes some experiments with electrified bodies. He found that other substances have the property of electrifying.

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A wire is an electrical product used to connect an electric current source to a consumer, components of an electrical circuit.

Section in electrical engineering - the cross-sectional area of ​​a conductor in a single-core wire or the sum of the cross-sectional areas of the conductors that make up a stranded wire; it is indicated in mm2 or in AWG calibers (among electricians and electrical engineers, 1 mm2 is often called “square”; for example, “wire, cross-section of 4 squares”). In America, wire and wire are labeled according to the standard cross-section legend table (see: AWG). In Russia, wire and wire are marked by cross-sectional area. A single-core winding wire in most cases is marked by the diameter of the conductive core.

The current strength is a physical quantity I equal to the ratio of the amount of charge Delta Q passing through a surface during Delta t to the value of this period of time. The cross-section of the conductor is often used as the surface under consideration. Usually indicated by the symbol I, from Fr. intensité du courant.

Electric power is a physical quantity that characterizes the speed of transmission or conversion of electrical energy. The unit of measure in the International System of Units (SI) is watt (Russian designation: W, international: W).

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