# resistivity

Resistivity (Rho) is defined as the resistance of a conductor of 1 m length and 1 qmm cross-section (A) at a temperature of 20 degrees Celsius. It is material dependent and its unit is ohms

x qmm/m.

ResistivityThe reciprocal of resistivity is conductivity. Resistivity is a fixed material constant. It changes with temperature depending on the temperature coefficient

. The ohmic resistance (R) of the conductor can be calculated from the resistivity, the conductor cross-section and the conductor length. To do this, the resistivity (Rho) is multiplied by the quotient of the conductor length to the conductor cross-section (rho x l/A). The resistivity (Rho) of conductors lies between 0.01 and 0.2, that of non-conductors between 10exp3 and 10exp12.