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Conductance Susceptance & Admittance

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Many of the time we ignore these terms i.e. conductance, Susceptance & admittance. May be because that “sounds” difficult or we don’t give much importance to this. But if you understand these terms it’ll really help you to understand the basics. And yes, believe me I can give you the easiest explanation of these terms and to get that you need to read the following article.

Also watch the following video to understand more clearly.

Black X White

True X False

Happy X Unhappy

You guys might have thinking what I am doing? Well’ we saw some words which are completely opposite to each other. And what we are going to see today in this article is the same. But the difference is that, these opposite terms are related to electrical engineering. You’ll understand just keep watching.

To understand the concept of Conductance, Susceptance & Admittance, it is important to know about Resistance, Reactance & Impedance, as it will help to get the things easily. And hence I would strongly recommend you to watch my video on Resistance, reactance & impedance.

We know about resistance. In simple words, it is an opposition offered to the flow of electrons. Now there is a term which is exactly opposite to the resistance, and it is known as, ‘simplicity offered to the flow of electrons’. And this term is called as “Conductance”. Whereas the term resistance denotes the opposition to the flowing electrons in a circuit, conductance represents the ease or easiness offered to the flow of electrons.  Resistance represent how much a circuit resist current, conductance represents how much a circuit conducts current. Unit of conductance is “MHOS” or simply ohms spelled backward and denoted by letter “G”. Many times, “Siemens” is also used as a unit of conductance.

Now, as we know conductance is opposite to resistance mathematically it is given by,

G = 1/R

So, in parallel circuits resistance diminishes but the conductance adds.

 




Now the opposition offered by capacitors and inductors is a bit different than resistance and we call it as “reactance”. Again, if you have not gone through my video on Resistance, reactance & impedance yet, I would strongly recommend you to go through that Video. So, the opposition offered by capacitors and inductors is a bit different than resistance and we call it as “reactance” and like resistor we measure it in Ohms.

Like, true has false, resistance has conductance, reactance has “Susceptance”. Susceptance is exactly opposite to reactance. Mathematically it is given by 1/X, the reciprocal of reactance. It is denoted by letter ‘B’ and measured in ‘mhos or Siemens’. Reactance is the measure of how much circuit reacts against change in current over time, while the Susceptance represent how much circuit is susceptible to conducting a changing current or simply how much circuit allows the changing current. Like Conductance, Susceptance also adds in parallel and diminish in series.




Circuit consisting of both i.e. resistor and inductor will offer both the types of oppositions i.e. resistance and reactance. We cannot call this kind opposition neither resistance nor reactance, as it is a combination of both. So, we need more suitable term for this kind of opposition and the term is known as “Impedance”.

True has false, resistance has conductance, Reactance has Susceptance, similarly we have “Admittance” for Impedance. Impedance is measure of how much alternating current is impeded or avoided in the circuit, while Admittance is a measure of how much alternating current is Admitted or allowed in the circuit. Like Conductance and Susceptance it is also measured is Siemens and it is denoted by letter “Y”.

So, how to remember these terms? It can be tricky but it’s easy believe me. Just remember the opposite words.

Black X White

Resistance X Conductance

 

True X False

Reactance X Susceptance

 

Happy X Unhappy

Impedance X Admittance

So, I hope this will help you to understand the concepts of conductance, Susceptance & admittance. The topic was suggested by one my subscriber, if you also have any topic suggestion you can mention that below in the comments. If you found the article helpful hit the like & share button. So, guys that’s all for this article, we’ll see you guys in the next one. Till then, keep reading. keep Learning.




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Gaurav J

About The Author

Gaurav J. Completed Diploma and Bachelors degree in Electrical Engineering. Currently working with High Voltage Switchgear industry. Founded "www.theelectricalguy.in" in January 2017.

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