Electrical resistance

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.
Category:Electric circuits