In AC circuits, what do the terms positive and negative refer to?

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In AC circuits, positive and negative indicate the instantaneous direction of current flow relative to a chosen reference direction. Since AC current reverses each half cycle, the current value switches sign: when i(t) is positive, current flows in the reference direction; when i(t) is negative, it flows in the opposite direction. The magnitude is always nonnegative, but the sign tells you which way the current is moving at that moment. The phase angle describes how the voltage and current relate in time (which one leads or lags), not the sign of the current itself. Resistance is a positive value that stays the same regardless of the current’s direction, so it doesn’t define positive or negative.