sreeraghuma
Branch Unspecified
29 Apr 2012

# Reactance Vs. Susceptance And Impedance Vs. Admittance - Difference?

Hi can any one tell the difference between reactance and susceptance ?
It can be a silly question😖 but i didnt get them and its difference!😭

hsirah5

Branch Unspecified
29 Apr 2012
Hi,
Reactance is the opposition caused to alternating emf/current. It may sound similar to resistance but reactance is observed only in case of alternating current, whereas resistance is the opposition to current both in the case of AC & DC.

In a capacitor, the charges that accumulate on the capacitance plate creates an electric field causes the capacitive reactance and opposes the electron flow. In inductors, the magnetic field that is created due to flow of current through an induction coil contributes to inductive reactance.

The total opposition to the flow of current/emf is called Impedance.

Admittance is a complementary measure of impedance and shows how much a circuit allows (or admits) current flow.
Susceptance is a measure how much a circuit is capable of conducting a varying current.

Assuming that you have knowledge on real and imaginary parts of powers, we can mathematically represent impedance as follows

Impedance = Resistance + j . Reactance (where j^2 = -1)
Reactance is the imaginary part of impedance.

Admittance = Conductance + j . Susceptance
Susceptance is the imaginary part of admittance.