707
2
m
m
v
V
v
=
=
We have P = IV = I 2R
3 An ac voltage v = vm sin wt applied to a pure inductor L, drives a current
in the inductor i = im sin (wt – p/2), where im = vm/XL XL = wL is called
inductive reactance The current in the inductor lags the voltage by
p/2