Video narration
Why can current peak at a different time from voltage in one AC circuit? Think of clock hands: their angle compares their positions. A phasor is an arrow representing an AC quantity. As it rotates at the AC frequency, its projection along a fixed line follows a sine wave. Compare voltage and current phasors at the same frequency. Their lengths show magnitudes; use the same convention for both, peak or RMS. That angle is not a physical gap. It is the phase difference: the timing offset between the quantities. For a pure resistor, voltage and current are in phase, rising and peaking together. A reactive load shifts their timing. Inductive current lags voltage, peaking after it; capacitive current leads voltage, peaking before it. The load shifts current in time; the angle between voltage and current phasors shows that shift.