S: (n) control panel, instrument panel, control board, board, panel (electrical device consisting of a flat insulated surface that contains switches and dials and meters for controlling other electrical devices) "he checked the instrument panel"; "suddenly the board lit up like a Christmas tree"
S: (n) reactor (an electrical device used to introduce reactance into a circuit)
S: (n) rectifier (electrical device that transforms alternating into direct current)
S: (n) relay, electrical relay (electrical device such that current flowing through it in one circuit can switch on and off a current in a second circuit)
S: (n) spark arrester (electrical device to reduce sparking when electrical contacts are opened or closed)
S: (n) spark plug, sparking plug, plug (electrical device that fits into the cylinder head of an internal-combustion engine and ignites the gas by means of an electric spark)
S: (n) tour, circuit (a journey or route all the way around a particular place or area) "they took an extended tour of Europe"; "we took a quick circuit of the park"; "a ten-day coach circuit of the island"
S: (n) circuit (an established itinerary of venues or events that a particular group of people travel to) "she's a familiar name on the club circuit"; "on the lecture circuit"; "the judge makes a circuit of the courts in his district"; "the international tennis circuit"
S: (n) circumference, circuit (the boundary line encompassing an area or object) "he had walked the full circumference of his land"; "a danger to all races over the whole circumference of the globe"
S: (n) circuit ((law) a judicial division of a state or the United States (so-called because originally judges traveled and held court in different locations); one of the twelve groups of states in the United States that is covered by a particular circuit court of appeals)