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The resistance of copper wire is approximately 1 ohms / 1000 feet for 10 AWG, 10 ohms / 1000 feet for 20 AWG, 100 ohms / 1000 feet for 30 AWG, and so on. [ 5 ] : 27 Because aluminum wire has a conductivity of approximately 61% of copper, an aluminum wire has nearly the same resistance as a copper wire that is two sizes ...
The conversion factor from square mils to circular mils is therefore 4/ π cmil per square mil: 4 π c m i l m i l 2 . {\displaystyle {\rm {{\frac {4}{\pi }}{\frac {cmil}{mil^{2}}}.}}} The formula for the area of an arbitrary circle in circular mils can be derived by applying this conversion factor to the standard formula for the area of a ...
Electrical resistivity (also called volume resistivity or specific electrical resistance) is a fundamental specific property of a material that measures its electrical resistance or how strongly it resists electric current. A low resistivity indicates a material that readily allows electric current.
Finally, in the reference, this table is supposed to be showing how these rules of thumb can be applied to a variety of other AWGs based on 10 AWG having 1 ohm per 1000 ft. That should be explained here, AND, 1 mΩ/ft should have been used as the starting point for 10 AWG rather than the 1.6 mΩ/ft used in this table.
Also called chordal or DC resistance This corresponds to the usual definition of resistance; the voltage divided by the current R s t a t i c = V I. {\displaystyle R_{\mathrm {static} }={V \over I}.} It is the slope of the line (chord) from the origin through the point on the curve. Static resistance determines the power dissipation in an electrical component. Points on the current–voltage ...
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Sometime around 1913 several copper samples from 14 important refiners and wire manufacturers were analyzed by the U.S. Bureau of Standards. The average resistance of the samples was determined to be 0.15292 Ω for copper wires with a mass of 1 gram of uniform cross section and 1 meter in length at 20 °C. In the United States this is usually ...
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