Electrical Admittance Calculator

Welcome to our engineering tutorial on the Electrical Admittance Calculator. In this tutorial, we will explore the concept of electrical admittance, its formula, and its real-life applications. Electrical admittance is a fundamental concept in electrical engineering that measures the ease with which an electric circuit or device allows the flow of alternating current. Understanding electrical admittance is crucial for analyzing and designing electrical circuits, and it plays a significant role in various practical scenarios.

Electrical Admittance Calculator
Resistance (R) ohms
Resistance (X) ohms
Electrical Admittance Calculator Results
Admittance (Y) = siemens

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Learn how to calculate electrical admittance and its practical applications with this engineering tutorial. Understand the formula and explore real-life examples.

Interesting Facts about Electrical Admittance

Before we delve into the formula and applications of electrical admittance, let's explore some interesting facts about this concept:

  • Electrical admittance is the reciprocal of electrical impedance, which measures the opposition to the flow of alternating current.
  • Admittance is represented by the symbol Y and is measured in units called siemens (S).
  • Electrical admittance consists of two components: conductance (G) and susceptance (B). Conductance represents the ability of a circuit to conduct electric current, while susceptance represents the ability of a circuit to store and release energy.
  • The magnitude of electrical admittance indicates the ease of current flow in a circuit, while the phase angle represents the phase relationship between the current and voltage.
  • Electrical admittance plays a vital role in the analysis and design of various electrical systems, including power transmission networks, communication systems, and electronic circuits.

The Formula for Electrical Admittance

The formula for electrical admittance is derived from Ohm's Law and complex numbers. It is expressed as:

Y = G + jB


  • Y is the electrical admittance.
  • G is the conductance component of the admittance.
  • B is the susceptance component of the admittance.
  • j represents the imaginary unit (√(-1)).

Both the conductance (G) and susceptance (B) components of admittance are real numbers, and the complex term jB accounts for the phase relationship between them.

Real-Life Example: Power Factor Correction

One practical application of electrical admittance is power factor correction. Power factor is a measure of how effectively electrical power is being utilized in an AC circuit. A low power factor indicates inefficient power usage and can lead to increased energy costs and equipment strain. Power factor correction is used to improve the power factor of electrical systems, thereby optimizing energy usage and reducing costs.

Electrical admittance plays a crucial role in power factor correction. By analyzing the electrical admittance of a system, engineers can determine the magnitude and phase angle of the current and voltage, allowing them to assess the power factor and identify areas for improvement.

For example, consider a commercial building with a large number of inductive loads such as motors and transformers. These loads have a lagging power factor, meaning the current lags behind the voltage waveform. By installing power factor correction capacitors in parallel with these loads, the reactive power component is reduced, improving the power factor. The electrical admittance calculation helps determine the required capacitance to achieve the desired power factor correction.

Let's walk through an example to illustrate the application of the Electrical Admittance Calculator in power factor correction:

Suppose we have a commercial building with an apparent power of 100 kVA and a power factor of 0.8 lagging. We want to improve the power factor to 0.95 by adding capacitors.

First, we calculate the current flowing through the system using the formula:

I = S / V


I is the current (in amperes)

S is the apparent power (in volt-amperes)

V is the voltage (in volts)

Let's assume the voltage is 480 volts. Plugging in the values, we get:

I = 100,000 / 480 = 208.33 A

Next, we calculate the existing reactive power (Q) using the formula:

Q = S * sqrt(1 - PF2)


PF is the power factor

Plugging in the values, we get:

Q = 100,000 * sqrt(1 - 0.82) = 60,000 VA

To improve the power factor, we need to calculate the additional reactive power required. We can do this using the electrical admittance formula:

Y = G + jB

Since we want to increase the power factor, we focus on the reactive component B. The formula for susceptance (B) is:

B = 1 / X


X is the reactance

In our case, we want to increase the power factor to 0.95, so the target reactance is:

X = sqrt(1 - PF2) / (PF * 2 * π * f * C)


f is the frequency (in Hz)

C is the capacitance (in farads)

Assuming a frequency of 60 Hz, we can rearrange the formula to solve for C:

C = sqrt(1 - PF2) / (PF * 2 * π * f * X)

Plugging in the values, let's say we choose a target reactance of 10 Ω:

C = sqrt(1 - 0.952) / (0.95 * 2 * π * 60 * 10) = 2.73 μF

This calculation gives us the required capacitance to achieve the desired power factor.

Finally, we determine the reactive power contribution of the capacitors using the formula:

Qcap = V2 * B


V is the voltage (in volts)

B is the susceptance (in siemens)

Plugging in the values, we get:

Qcap = 4802 * 10 = 230000 var

By adding capacitors with a capacitance of 2.73 μF, the system's reactive power contribution increases by 230,000 var. This additional reactive power compensates for the lagging reactive power of the inductive loads, resulting in an improved power factor of 0.95.

This example demonstrates how the Electrical Admittance Calculator can be used to determine the required capacitance for power factor correction. By understanding the electrical admittance of a system, engineers can analyze the power factor, identify areas for improvement, and design the appropriate solution using capacitors.

Real-life applications of power factor correction can be found in various industries. For instance, in industrial settings with large motor-driven machinery or manufacturing plants with significant inductive loads, power factor correction helps optimize energy usage, reduce electricity costs, and improve system efficiency. It is also commonly implemented in commercial buildings, hospitals, data centers, and other facilities where efficient power distribution is crucial.

In conclusion, the Electrical Admittance Calculator is a valuable tool for electrical engineers and professionals involved in power system analysis and design. It allows them to calculate the required capacitance for power factor correction and optimize the power factor of electrical systems. By improving power factor, businesses can achieve cost savings, reduce energy consumption, and enhance the overall performance and efficiency of their electrical infrastructure.