[TowerTalk] Fwd: Tower base/Ufer ground

[Roger (K8RI) on TT]

 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)