capacitor and inductance in frequency domain

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interestingly,

∠Ic = ∠Vc + π/2

• This means the angle (or phase) of the current Ic is 90 degrees (π/2 radians) ahead of the angle (phase) of the voltage Vc.

∠VL = ∠IL + π/2

• The angle of the voltage is 90 ahead of the current.
• Key Point: “The current lags the voltage by 90°.” This is the key characteristic of an inductor in an AC circuit. Because voltage leads, it is also correct to say current lags.