What you need to know about tuning
Coils have something in common with condensers in that they too present opposition to the flow of AC, again called reactance, although, unlike condensers, they present little or no resistance to DC. The reactance of a coil also differs from that of a condenser in that it increases with frequency. This leads to the interesting and useful fact that if a coil and a condenser are connected in parallel the reactance of each will be equal at only one particular frequency. At that point maximum voltage is developed across the two and the resonant frequency of the circuit is attained.
We now have to consider the question of phase. It is a massive simplification of a complex subject to say that it approximates ...
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