But via Spanish it became " cifra " and thence " cifre " in Old French and "cipher" in modern English and " chiffre " in modern French.
Go Back Resistivity and Conductivity The electrical resistance of a wire would be expected to be greater for a longer wire, less for a wire of larger cross sectional area, and would be expected to depend upon the material out of which the wire is made.
Experimentally, the dependence upon these properties is a straightforward one for a wide range of conditions, and the resistance of a wire can be expressed as The factor in the resistance which takes into account the nature of the material is the resistivity.
Although it is temperature dependent, it can be used at a given temperature to calculate the resistance of a wire of given geometry. It should be noted that it is being presumed that the current is uniform across the cross-section of the wire, which is true only for Direct Current.
For Alternating Current there is the phenomenon of " skin effect " in which the current density is maximum at the maximum radius of the wire and drops for smaller radii within the wire. At radio frequencies, this becomes a major factor in design because the outer part of a wire or cable carries most of the current.
The inverse of resistivity is called conductivity. There are contexts where the use of conductivity is more convenient.Presentation FX provides free PowerPoint templates and backgrounds for students, teachers, and professionals searching for great looking PowerPoint templates to download.
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