A quantum mechanical effect decreases the strength of these devices when their constituent materials have a low density of states. AC coupling uses these devices as high-pass filters, blocking direct current. In [emphasize] (10[1])series, the strength of these devices equals the (10[1])reciprocal of a (10[1])sum of (10[4]-5[1])reciprocals. Resistance times a characteristic quantity of these devices equals the time constant. An inductor and one of these devices make an (10[1])oscillating circuit. A quantity named (10[1])for these devices, which equals charge over voltage, can be increased by inserting a (10[1])dielectric between two parallel (10[1])plates. For 10 points, what circuit elements that store energy in electric fields name a quantity measured in (10[1])farads? ■END■