Practice portal › Alternating Current › AC Through R, L and C
Asked in GUJCET 2019 · Phase relationships and phasors
Idea: in a series L-C circuit the same current flows through both; V_L leads it by π/2 and V_C lags it by π/2.
These two voltages are opposite, so the net voltage is I(X_C-X_L), in the direction of V_C when X_C>X_L.
With no resistance, the net reactance is the whole impedance, so the phase difference is a full π/2 and the circuit acts as a net capacitor.
So the potential lags behind the current by π/2.
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