What is the Admittance of a Circuit?

The Admittance of a circuit is the measure of the circuit's conductance, which is its ability to conduct electric current through it. Being that admittance is the measure of a circuit's conductance, it is the direct opposite of the circuit's impedance, its opposition to the flow of current; so, thus, to calculate admittance, the formula (1/Impedance) is used. Admittance is measured in a unit called siemens (siemen symbol admittance).

Let's now take a look at a circuit, as an example, and calculate its admittance so you can see a real-world problem of it:

Admittance of a Circuit

Since all the impedance values of the components, the resistor, capacitor, and inductor, are given, all we have to do is use the formula, 1/impedance, to calculate each of their admittance values. Below are the calculations:

Admittance values of circuit

Now that we have all the admittance values of the components, all we must do now is simply add them to get the final answer. Here we end up putting the final answer in polar form shown below.

Final calculation of admittance

Related Resources

Why does a Circuit Always Have to Have Ground?

What is Impedance?

Source Transformation of Circuits

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