From the dictionary: There is no need to go any farther. Forget your
calculations, this is the definition.
Electrical resistivity quantifies how strongly a given material opposes
the flow of electric current. A low resistivity indicates a material
that readily allows the movement of electric charge. Resistivity is
commonly represented by the Greek letter ρ. The SI unit of electrical
resistivity is the ohm⋅metre although other units like ohm⋅centimetre
are also in use. *As an example, if a 1 m × 1 m × 1 m solid cube of
material has sheet contacts on two opposite faces, and the resistance
between these contacts is 1 Ω, then the resistivity of the material is 1
Ω⋅m.* (that is misleading as the formula actually gives ohms per cubic
meter, not ohms per meter.
Please note Resistivity is in ohms per cubic Centimeter or ohms per
cubic meter not ohms per meter, or centimeter as is often stated which
is incorrect.
When calculating you must use ohms cc^3 or M^3 for the units to properly
cancel.
Too many texts use the simplified versions which are misleading.
73
Roger (K8RI)
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