mains supply
121Scottish Gas Board — The Scottish Gas Board was a state owned utility providing gas for light and heat to industries and homes in Scotland. The Board was established on May 1, 1949, and dissolved in 1973 when it became a Region of the British Gas Corporation.First… …
122Transformer 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 …
123Multimeter — A digital multimeter A multimeter or a multitester, also known as a VOM (Volt Ohm meter), is an electronic measuring instrument that combines several measurement functions in one unit. A typical multimeter may include features such as the ability …
124Ground and neutral — For uses of the term ground or earth in electricity but not in the context of mains wiring, see ground (electricity). Since the neutral point of an electrical supply system is often connected to earth ground, ground and neutral are closely… …
125Linn Sondek LP12 — The Linn Sondek LP12 transcription turntable (often shortened to LP12) is produced by Glasgow based Linn Products, manufacturers of hi fi, home theatre, and multi room audio systems. Its name is derived from the 12 vinyl LP (gramophone record)… …
126City of Nottingham Water Department — The City of Nottingham Water Department (1912–1974), formerly the Nottingham Corporation Water Department (1880–1912), was responsible for the supply of water to Nottingham from 1880 to 1974.[1] Contents 1 Early History 1696–1880 1.1 Original… …
127Operational 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… …
128Power over Ethernet — or PoE technology describes a system to transfer electrical power, along with data, to remote devices over standard twisted pair cable in an Ethernet network. This technology is useful for powering IP telephones, wireless LAN access points,… …
