unit of electrical power named after scottish inventor
Watt The watt is named after the Scottish inventor James Watt for his contributions to the development of the steam engine. The measurement unit was recognized by the Second Congress of the British Association for the Advancement of Science in 1882, concurrent with the start of commercial power production from both water and steam. In 1960 the 11th General Conference on Weights and Measures adopted it for the measurement of power into the International System of Units (SI).
History of electric power transmission Extremely bright arc lights were too bright, and with the high voltages and sparking/fire hazard, too dangerous to use indoors.[15] In 1878 inventor Thomas Edison saw a market for a system that could bring electric lighting directly into a customer's business or home, a niche not served by arc lighting systems.[16] After devising a commercially viable incandescent light bulb in 1879, Edison went on to develop the first large scale investor-owned electric illumination "utility" in lower Manhattan, eventually serving one square mile with 6 "jumbo dynamos" housed at Pearl Street Station.[7][9][17][18] When service began in September 1882, there were 85 customers with 400 light bulbs. Each dynamo produced 100 kW2—enough for 1200 incandescent lights, and transmission was at 110 V via underground conduits. The system cost $300,000 to build with installation of the 100,000 feet (30,000 m) of underground conduits one of the most expensive parts of the project. Operating expenses exceeded income in the first two years and fire destroyed the plant in 1890.[19] Further, Edison had a three wire system so that either 110 V or 220 V could be supplied to power some motors.