Inductive reactiance is the AC resistance of an inductor. It turns out that an inductor impends AC current in much the same way a DC current (or even AC current, for that matter [with exceptions at higher frequencies]) is impeded by a resistor.
Ohms law for resistance:
V = I*R where *I* is the current and *R* is the resistance
works the same for reactance:
V = I*X where *I* is the constant frequency AC current and *X* is the reactance.
Now, there are other things going on such as phase shifts between the voltage and current (voltage leads current in an inductor).
The rest can be gleaned from a text book or by Google search.
