What this means in practical terms is that, the total impedance of a tank circuit is infinite behaving as an open circuit at resonance. With capacitive and inductive reactances equal to each other, the total impedance increases to infinity, meaning that the tank circuit draws no current from the AC power source! Plugging in the values of L and C in our example circuit, we arrive at a resonant frequency of What happens at resonance is quite interesting. So there we have it: a formula to tell us the resonant frequency of a tank circuit, given the values of inductance L in Henrys and capacitance C in Farads. Because inductive reactance increases with increasing frequency and capacitive reactance decreases with increasing frequency, there will only be one frequency where these two reactances will be equal. A condition of resonance will be experienced in a tank circuit when the reactance of the capacitor and inductor are equal to each other.
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