This resembles to a capacitor functioning, albeit in the opposite way, since capacitors do not respond to the initial current surge rather stores it gradually.
Therefore inductors and capacitors compliment each when used together in an electronic circuit.
An inductor will basically behave and produce a short across itself when subjected to a DC, while offer an opposing or restricting response when applied with an AC.
The magnitude of this opposing response or force of an inductor to an AC or alternating current is called the reactance of the inductor.
The above reactance will depend on the magnitude of the frequency and current of the AC, and will be directly proportional to them.
Inductors are generally also named as coils since all inductors mostly are made up of coils or turns of wires.
The above discussed property of an inductor which fundamentally involves opposition of instantaneous current entries across it is termed as the inductance of an inductor.
This property of an inductor has many potential applications in electronic circuits such as for suppressing high frequencies, suppressing surge currents, for bucking or boosting voltages etc.
Due to this suppressing nature of inductors these are also called “chokes” which refers to the “choking” effect or the suppression created by these components for electricity.
Inductors and Capacitors in Series
As indicated in the above, a capacitor and an inductor which are complimentary to each other, could be connected in series or parallel for obtaining some very useful effects.
When connected in series as shown in the figure given below, the combination resonates at a particular frequency depending upon their values which results in the creation of a minimum impedance across the combination.
For so long as the resonant point is not reached, the combination presents a very high impedance across itself.
Impedance refers to the opposing property to AC, similar to resistance which does the same but with DC.
When connected in parallel (see figure below), the response is just the opposite, here the impedance becomes infinite at the resonant point and as long as this point is not reached the circuit offers extremely low impedance to the following current.
Now we can imagine why in tank circuits, the current across such combination becomes the highest and optimal the moment a resonant point is achieved.