While studying electrical science, I was told that when an alternating current passes through an inductor, current lags voltage by 90•. And when through a capacitor, current leads voltage by 90•. But while studying transistors in electronics, I was told that AC passes through a capacitor but blocked by an inductor. And DC is blocked by a capacitor but allowed by an inductor. So I am confused WHETHER AC PASSES THROUGH AN INDUCTOR.