What Is The Unit Of Susceptance?

Are you curious to know what is the unit of susceptance? You have come to the right place as I am going to tell you everything about the unit of susceptance in a very simple explanation. Without further discussion let’s begin to know what is the unit of susceptance?

Electrical circuits are essential components of modern technology and infrastructure. To analyze and design these circuits, engineers and technicians rely on various electrical parameters and units. One such parameter is susceptance, a crucial element in AC circuit analysis. In this blog, we will explore what susceptance is, its significance in electrical circuits, and the unit used to measure it.

What Is The Unit Of Susceptance?

Susceptance is an electrical parameter that quantifies the ability of a circuit or component to store or release reactive power in response to changes in voltage or current in an alternating current (AC) circuit. It is a measure of the capacitive or inductive reactance of a component, and it helps in characterizing the behavior of elements such as capacitors and inductors in AC circuits.

Significance Of Susceptance:

  1. Power Factor Correction: Susceptance is crucial for power factor correction in AC circuits, ensuring that the circuit operates efficiently and without excessive energy losses.
  2. Resonance Analysis: In resonance analysis, susceptance plays a significant role in determining the frequency at which a circuit will resonate, particularly in LC (inductor-capacitor) circuits.
  3. Impedance Matching: Understanding susceptance is essential for impedance matching, which optimizes the power transfer between components in a circuit.

The Unit Of Susceptance

Susceptance is a complex quantity and is represented by the symbol “B.” It is the reciprocal of reactance and is measured in siemens (S), which is the unit of electrical conductance. One siemens is equivalent to one ampere per volt (A/V).

Mathematically, susceptance (B) is expressed as:

B = 1 / X


  • B is the susceptance measured in siemens (S).
  • X is the reactance measured in ohms (Ω).

In simple terms, the unit of susceptance (S) quantifies how a component or circuit behaves in terms of conducting reactive power in response to changes in voltage or current.

Practical Application

Susceptance, along with conductance, is used to describe the complex impedance of an electrical circuit or component. In AC circuit analysis, it aids in understanding how various elements contribute to the overall behavior of the circuit, whether it’s capacitive, inductive, or a combination of both. Engineers use susceptance values to design and analyze circuits, enabling them to optimize performance, power factor, and efficiency.


In the world of electrical circuits, susceptance is a vital parameter that helps engineers and technicians understand the behavior of components in AC circuits. The unit of susceptance, measured in siemens (S), quantifies a circuit’s ability to conduct or store reactive power. This knowledge is essential for designing efficient circuits, performing power factor correction, and ensuring proper impedance matching in various electrical applications. By comprehending susceptance and its unit, professionals in the electrical field can make informed decisions to optimize the performance of AC circuits.


What Is Susceptance Formula?

The capacitive susceptance is defined as the reciprocal of the reactance. B = 1 X C = 2 π f C. It is measured in Siemens. Just as we resistance which is a measure of opposition to the flow of current, we have capacitive susceptance that is a measure of a purely capacitive circuit’s ability to pass current.

What Is The Unit Of Conductance And Susceptance?

The siemens (symbol: S) is the unit of electric conductance, electric susceptance, and electric admittance in the International System of Units (SI).

What Is The Unit Of Admittance Y?

Admittance is measured in the unit of Siemens, and its symbol is “Y”. Like impedance, admittance is a complex quantity rather than a scalar.

What Is Susceptance In Physics?

Susceptance is a measure of how easy it is for alternating current to pass through a capacitance or an inductance. While reactance is the measure of how much a circuit reacts against change in current over time, susceptance is the measure of how much a circuit is susceptible to conducting a changing current.

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