E.2.4 Capacitors and Inductors

Sources of 110 V AC and DC are fed alternately to a standard incandescent bulb in series with a large inductance or capacitance. The capacitance will "pass"AC but "block" DC, whereas the inductance will "block" AC and "pass" DC. With the AC supply, if an iron core is lowered into the inductor coil, increasing its inductance, the light bulb becomes dramatically dimmer, illustrating a theater light dimmer circuit.