alternating-current supply
81Transformer types — Circuit symbols Transformer with two windings and iron core. Step down or step up transformer. The symbol shows which winding has more turns, but not usually the …
82technology, history of — Introduction the development over time of systematic techniques for making and doing things. The term technology, a combination of the Greek technē, “art, craft,” with logos, “word, speech,” meant in Greece a discourse on the arts, both… …
83Nikola Tesla — Tesla, aged 37, 1893, photo by Sar …
84Transmitter — For biologic transmitters, see transmitter substance. Commercial FM broadcasting transmitter at radio station WDET FM, Wayne State University, Detroit, USA. It broadcasts at 101.9 MHz with a radiated power of 48 kW. In electronics and… …
85List of IEC standards — In order to distinguish standards published by the International Electrotechnical Commission numerically from other international standards, their number range was shifted in 1997 by adding 60000. So what used to be called IEC 27 is now… …
86Contactor — AC contactor for pump application. In semiconductor testing, contactor can also refer to the specialised socket that connects the device under test. In process industries a contactor is a vessel where two streams interact, for example, air and… …
87TRAXX — Bombardier TRAXX family (electric) TRAXX F140 AC1 : Deutsche Bahn AG Class 185 Power type electric Builder Bombardier Transportation Model TRAXX F140 AC …
88Protective relay — See also: Power system protection In electrical engineering, a protective relay is a complex electromechanical apparatus, often with more than one coil, designed to calculate operating conditions on an electrical circuit and trip circuit breakers …
89List of energy abbreviations — This is a list of abbreviations found in the context of energy issues. Contents: 0–9 A B C D E F G H I J K L M N O P Q R S T U V W X Y …
90Rotary converter — A rotary converter is a type of electrical machine used to convert one form of electrical power into another form. There are several types:* Rotary Phase Converter (RPC) for converting single phase power to three phase power. See Rotary phase… …
