Conductance: Céard é?
Cén é an Conductance?
Conductance (a théarf mar electrical conductance) is defined as the potential for a substance to conduct electricity. Conductance is the measure of how easily electrical current (i.e. flow of charge) can pass through a material. Conductance is the inverse (or reciprocal) of electrical resistance, represented as 1/R.
To have a better understanding of conductance, one must recall the resistance of an object. In a qualitative sense, the resistance tells us how difficult it is for an electrical current to pass. The resistance between two points can be defined in the quantitative sense as the difference in voltage that is needed to carry a unit current across the two specified points.
The resistance of an object is represented as the ratio of the voltage across something to the current passing through it. The resistance is measured in Ohms. The conductance of a component is a determination of how quickly current can flow within the component. Conductance is measured in Siemens (S).
Conductance Formula and Measuring Units
In electronics, conductance is a measure of the current generated for a given applied voltage by a circuit device. Typically denoted by the letter G, conductance is resistance reciprocal, R. To define the formula, we need to apply Ohm’s law which states that 
from which R can be calculated as
The word conductivity is the opposite of this expression. It is expressed as a current to voltage ratio.
Conductance is expressed as G and the measuring unit was “mho”. Later after a few years, researchers replaced the unit with “Siemens” which was denoted by the letter S. When looking at resistance vs conductance – conductance is the inverse of resistance (i.e. 1/resistance), as shown below:
Cén chaochuaí an Conductance?
Conductance can be calculated with the help of the resistance, current, voltage and conductivity.
For example for a particular circuit element that has a resistance of 
, determine the conductance value. We know
On substituting the value of given R and value of conductance can be obtained as
The next example is an electric circuit, in which a 5V input generates a current of 0.3A in a length of wire. According to Ohm’s law V=IR from which resistance can be calculated as(5)
