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Direct current dc electrical circuits by ron kurtus revised 14 august 2005 a direct current dc electrical circuit consists of a source of dc electricity with a conducting wire going from one of the source terminals to a set of electrical devices and then back to the other terminal in a complete circuit. Dc schematics often referred to as elementary wiring diagrams are the particular schematics that depict the dc system and usually show the protection and control functions of the equipment in the substation it should be noted that sometimes the control functions are supplied by ac and are included in the elementary diagram refer to figures 6 and 8. An electric circuit is a closed loop with a continuous flow of electric current from the power supply to the load here are ten simple electric circuits commonly found around the home electric circuits like ac lighting circuit battery charging circuit energy meter switch circuit air conditioning circuit thermocouple circuit dc lighting . Wiring leds correctly series parallel circuits explained 7 months ago by brooke sault 64980 views hopefully those looking for practical information on electrical circuits and wiring led components found this guide first its likely though youve already read the wikipedia page about series and parallel circuits here maybe a few other google search results on the subject and are . Power supply diagram hi low voltage power supply best useful ac dc power supply circuit diagrams and wirings