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The SI unit of electrical resistance is the ohm ( Ω ), while electrical conductance is measured in siemens (S) (formerly called the 'mho' and then represented by ℧ ). The resistance of an object depends in large part on the material it is made of.
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Conductance measures how easy it is for electric current to flow and is the inverse of resistance. Conductance is symbolized by the letter “G” and is measured in units of siemens or mhos.
Thus the resistance of the conductor is inversely proportional to its area, that is: R 1/∝ A, or R ∝ 1/A. In other words, we would expect the electrical resistance of a conductor (or wire) to be proportionally less the greater is its cross-sectional area.
The conductance is the inverse of resistance. It is the allowance of the electrical current through a conductor, denoted by “G” and measured in Siemens represented by the symbol of “Mho” (℧).
Review the key terms, equations, and skills related to current, resistance, and resistivity, including how to find the current direction and what resistance depends on.
Conductivity, σ, is the inverse of resistivity: Conductivity has SI units of siemens per metre (S/m). General scalar quantities. If the geometry is more complicated, or if the resistivity varies from point to point within the material, the current and electric field will be functions of position.
Electrical conductance (G) is measured in units of Siemens (S). This is the inverse of resistance (R) which is measured in units of Ohms (Ω). Personally, I prefer the old unit unit called the mho abbreviated ℧. Note that mho is ohm spelled backwards.
