How To Find Resistivity From A Graph
resistivity
electronics
Alternating titles: specific resistivity
resistivity, electrical resistance of a conductor of unit cross-sectional area and unit of measurement length. A feature property of each material, resistivity is useful in comparison various materials on the basis of their ability to conduct electric currents. High resistivity designates poor conductors.
Resistivity, normally symbolized by the Greek letter rho, ρ, is quantitatively equal to the resistance R of a specimen such every bit a wire, multiplied by its cross-exclusive area A, and divided by its length l; ρ = RA/50. The unit of resistance is the ohm. In the metre-kilogram-second (mks) system, the ratio of area in square metres to length in metres simplifies to just metres. Thus, in the metre-kilogram-second system, the unit of measurement of resistivity is ohm-metre. If lengths are measured in centimetres, resistivity may be expressed in units of ohm-centimetre.
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The German physicist Georg Simon Ohm discovered the bones law of electric conduction, which is now called Ohm's law. His police relates the...
The resistivity of an exceedingly good electric usher, such as hard-drawn copper, at 20° C (68° F) is i.77 × 10- 8 ohm-metre, or 1.77 × 10- vi ohm-centimetre. At the other extreme, electrical insulators have resistivities in the range 101 ii to 10ii 0 ohm-metres.
The value of resistivity depends also on the temperature of the material; tabulations of resistivities usually list values at 20° C. Resistivity of metallic conductors mostly increases with a rise in temperature; only resistivity of semiconductors, such as carbon and silicon, generally decreases with temperature rise.
Conductivity is the reciprocal of resistivity, and information technology, besides, characterizes materials on the basis of how well electrical current flows in them. The metre-kilogram-2d unit of conductivity is mho per metre, or ampere per volt-metre. Adept electrical conductors have high conductivities and low resistivities. Good insulators, or dielectrics, have high resistivities and depression conductivities. Semiconductors have intermediate values of both.
The Editors of Encyclopaedia Britannica This commodity was about recently revised and updated past Adam Augustyn.
Source: https://www.britannica.com/science/resistivity
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