automatic high voltage control
81Switchgear — The term switchgear, used in association with the electric power system, or grid, refers to the combination of electrical disconnects, fuses and/or circuit breakers used to isolate electrical equipment. Switchgear is used both to de energize… …
82Watford DC Line — 378210 at Watford Junction with a service from London Euston. Overview Type Commuter rail, Rapid transit …
83Elliott Cresson Medal — given to Emile Berliner in 1913 Presented by Franklin Institute Country US …
84Welding power supply — A welding power supply is a device that provides an electric current to perform welding. Welding usually requires high current (over 80 amperes) and it can need above 12,000 amps in spot welding. Low current can also be used; welding two razor… …
85Alstom — S.A. Type Société Anonyme Traded as Euronext: ALO …
86Warning sign — redirects here. For other uses, see Warning Sign (disambiguation). For a sign on a vehicle or building relating to it or its contents, see placard. A traffic warning sign is a type of traffic sign that indicates a hazard ahead on the road that… …
87Burglar alarm — Silent alarm redirects here. For the album, see Silent Alarm (album). Burglar (or intrusion), fire and safety alarms are all electronic today. Sensors are connected to a control unit via a low voltage hardwire or narrowband RF signal which is… …
88Arc lamp — The electric arc in an arc lamp consists of gas which is initially ionized by a voltage and is therefore electrically conductive. To start an arc lamp, usually a very high voltage is needed to ignite or strike the arc. This requires an electrical …
89Mobile radio — This article is about professional equipment. For mobile radios used in amateur radio, see amateur radio mobile operation. Mobile radio or mobiles refer to wireless communications systems and devices which are based on radio frequencies, and… …
90Otto J. M. Smith — Born August 6, 1917(1917 08 06 …
