Resistance is the
obstruction/opposition in the flow
of current .
R = V/ I
Reactance :-
It is the opposition to the change in
the flow of current in an
alternating current circuit due to
inductance and capacitance.
Inductive
Reactance
Capacitive
Reactance
Reactance that occurs in an inductor is known as
inductive reactance.
Reactance that occurs in a capacitor is known as
capacitive reactance.
XL = inductive reactance (ohms)
f = frequency (Hz)
L = inductance (henrys)
XC = capacitive reactance (ohms)
C = capacitance (farads)
IMPEDANCE
Impedance is the combination of resistance and
reactance (both inductive and capacitive) .
It is a complex number, containing both real and imaginary
parts.
(The real part of impedance is resistance, while the
imaginary part is reactance.)
Z = magnitude of impedance (ohms)
XT = total reactance (ohms) = XL – XC
In phasor terms, impedance Z is represented as a combination of
resistance R and reactance X as:
X=R+jX
Admittance
Admittance is the reciprocal of
impedance
Y = 1/ Z