Electrical resistance (measured in Ohms) is a measure of how much current will flow through a circuit for a given voltage. It is the reciprocal of conductance. A related property is electrical resistivity, ρ which is property inherent to the material, given by

 \rho = R \frac{A}{L}

For DC circuits, resistance is related to voltage and current by Ohm's law,

V = IR

For AC circuits, it is the real part of impedance.

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