![]() The "international units" were dominant from 1909 until 1948. (Also used: 1 A 2 × 1 Ω.) The watt was defined as equal to 10 7 units of power in the "practical system" of units. Siemens' definition was adopted as the "international" watt. In October 1908, at the International Conference on Electric Units and Standards in London, so-called "international" definitions were established for practical electrical units. Siemens defined the unit consistently within the then-existing system of practical units as "the power conveyed by a current of an Ampère through the difference of potential of a Volt". Noting that units in the practical system of units were named after leading physicists, Siemens proposed that watt might be an appropriate name for a unit of power. William Siemens in August 1882 in his President's Address to the Fifty-Second Congress of the British Association for the Advancement of Science. The unit name was proposed initially by C. The watt is named after the Scottish inventor James Watt.
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