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is equivalent to a pure resistance. (E5C12) '''The coordinate system that is often used to display the resistive, inductive, and/or capacitive reactance components of an impedance is rectangular coordinates.''' (E5C13) The coordinate system that is often used to display the phase angle of a circuit containing resistance, inductive and/or capacitive reactance is polar coordinates. (E5C14)
The polarity of the voltage changes as the energy is passed back and forth between the capacitor and inductor producing an AC type sinusoidal voltage and current waveform. This process then forms the basis of an LC oscillators tank circuit and theoretically this cycling back and forth will continue indefinitely.