21.   MMC Networks, which is based in Sunnyvale, Calif., designs chips to speed the connections between fiber optic communications lines and electrical circuits.

22.   Modern electrical circuits have a third, wire for grounding that adds protection.

23.   Normally, a person flips a switch and directly completes an electrical circuit.

24.   One of his graduate students pressed a mask into a layer of plastic, preparing to transform the material into a pattern of electrical circuits.

25.   Owen said the public-address system in the school went out Thursday morning, apparently because shifting snow on the roof knocked out an electrical circuit.

26.   Other PassPort users on the same electrical circuit could swipe data from your network.

27.   Plants can be turned into sensors for burglar alarms simply by connecting them to an electrical circuit, says a former IBM researcher.

28.   Since each plastic component was built with wiring inside, the resulting structure forms a complete electrical circuit.

29.   Sometimes, it is just another electrical circuit that can be controlled with the flip of a switch.

30.   Spikes of current flow through household electrical circuits several times a day.