What explains the phenomenon of electrical resonance?

With resonance in a series circuit, the voltages on the coil and capacitor at any moment of time are the same in magnitude and opposite in sign. The sum of the voltages across the coil and the capacitor turns out to be zero, the total voltage across the three elements of the circuit is equal to the voltage across the resistor. As a result, the value of the current in the electrical circuit consisting of a series-connected resistor, capacitor and coil at resonance is the same as when only one resistor is turned on.

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