of much current interest
51Electronic amplifier — A practical amplifier circuit An electronic amplifier is a device for increasing the power of a signal. It does this by taking energy from a power supply and controlling the output to match the input signal shape but with a larger amplitude. In… …
52religion, study of — Introduction attempt to understand the various aspects of religion, especially through the use of other intellectual disciplines. The history of mankind has shown the pervasive influences of religion, and thus the study of religion,… …
53Electric power transmission — Electric transmission redirects here. For vehicle transmissions, see diesel electric transmission. 400 kV high tension transmission lines near Madrid Electric power transmission or high voltage electric transmission is the bulk transfer of… …
54Severn Barrage — The Severn Barrage is the name of a number of ideas for building a barrage from the English coast to the Welsh coast over the Severn tidal estuary. Ideas for damming or barraging the Severn estuary (and Bristol Channel) have existed since the… …
55transistor — /tran zis teuhr/, n. 1. Electronics. a semiconductor device that amplifies, oscillates, or switches the flow of current between two terminals by varying the current or voltage between one of the terminals and a third: although much smaller in… …
56European exploration — Introduction the exploration of regions of the Earth for scientific, commercial, religious, military, and other purposes by Europeans beginning in the 15th century. The motives that spur human beings to examine their environment are… …
57Alan Greenspan — Infobox President | name =Alan Greenspan nationality = American imagesize =176px order =13th Chairman of the Federal Reserve term start =August 11, 1987 term end =January 31, 2006 president =Ronald Reagan George H. W. Bush Bill Clinton George W.… …
58Financial history of the Dutch Republic — describes the history of the interrelated development of financial institutions in the Dutch Republic. The rapid economic development of the country after the Dutch Revolt in the years 1585 1620, described in Economic History of the Netherlands… …
59battery — /bat euh ree/, n., pl. batteries. 1. Elect. a. Also called galvanic battery, voltaic battery. a combination of two or more cells electrically connected to work together to produce electric energy. b. cell (def. 7a). 2. any large group or series… …
60Battery — /bat euh ree/, n. The, a park at the S end of Manhattan, in New York City. Also called Battery Park. * * * Any of a class of devices, consisting of a group of electrochemical cells (see electrochemistry), that convert chemical energy into… …
