operate on mains power supplies
51Yvonne Cormeau — Infobox Military Person name=Yvonne Cormeau caption= born=birth date|1909|12|18 died=death date|1997|12|25 placeofbirth=Shanghai, China placeofdeath= nickname= Annette allegiance=United Kingdom, France branch=Special Operations Executive, French… …
52environmental works — ▪ civil engineering Introduction infrastructure that provides cities and towns with water supply, waste disposal, and pollution control services. They include extensive networks of reservoirs, pipelines, treatment systems, pumping stations …
53Railway electrification system — Railway electrification supplies electrical energy to railway locomotives and multiple units so they can operate without having a reciprocating engine of their own.CharacteristicsThe main advantage of electric traction is a higher power to weight …
54Business and Industry Review — ▪ 1999 Introduction Overview Annual Average Rates of Growth of Manufacturing Output, 1980 97, Table Pattern of Output, 1994 97, Table Index Numbers of Production, Employment, and Productivity in Manufacturing Industries, Table (For Annual… …
55coal mining — Coal was very important in the economic development of Britain. It was used as fuel in the factories built during the Industrial Revolution and continued to be important until the 1980s. The main coalfields are in north east England, the north… …
56Sustainable energy — Renewable energy …
57Meter Point Administration Number — A Meter Point Administration Number, also known as MPAN, Supply Number or S Number, is a 21 digit reference used in Great Britain to uniquely identify electricity supply points such as individual domestic residences. The gas equivalent is the… …
58Operational amplifier — A Signetics μa741 operational amplifier, one of the most successful op amps. An operational amplifier ( op amp ) is a DC coupled high gain electronic voltage amplifier with a differential input and, usually, a single ended output.[1] An op amp… …
59District heating — Biomass fired district heating power plant in Mödling, Austria …
60High-voltage direct current — HVDC or high voltage, direct current electric power transmission systems contrast with the more common alternating current systems as a means for the bulk transmission of electrical power. The modern form of HVDC transmission uses technology… …
