12)
where  
m
m
v
i
= ωL
is the amplitude of the current The quantity w L is
analogous to the resistance and is called inductive reactance, denoted
by XL:
XL = w L
(7 13)
The amplitude of the current is, then
m
m
L
v
i
=X
(7 14)
The dimension of inductive reactance is the same as that of resistance
and its SI unit is ohm (W)