rms current
I
[
 A]
A
I = 
2
im
, im is the amplitude of
the ac current Reactance:
     Inductive
XL
[M
 L
2 T
–3 A
–2]
XL =  L
     Capacitive
XC
[M
 L
2 T
–3 A
–2]
XC = 1/ C
Impedance
Z
[M
 L
2 T
–3 A
–2]
Depends 
on 
elements
present in the circuit Resonant
wr or w0
[T
–1]
Hz
w0 
LC
1

 for a
frequency
series RLC circuit
Quality factor
Q
Dimensionless
0
0
1
L
Q
R
C R
ω
ω
=
=
 for a series
RLC circuit Power factor
Dimensionless
= 
cosf, 
f 
is 
the 
phase
difference 
between 
voltage
applied 
and 
current 
in
the circuit