The conversion factor is 3.41 BTU/hr/watt. The production of lamps of 100 watt and more is banned. Magnitude of 10 Watt per Ampere are common. The unit for power is the watt (symbol&colon; W). The milliwatt (mW) is equal to one thousandth (10) of a watt. In 1980, he played keyboards, bass and provided voice in the rock band "Watt 4". James Watt (another Scotsman) and Matthew Boulton. The nanowatt (nW) is equal to one billionth (10) of a watt. The femtowatt (fW) is equal to one quadrillionth (10) of a watt. The attowatt (aW) is equal to one quintillionth (10) of a watt. It was produced by Andrew Watt and Louis Bell. Jimmy Spark's voice was that of Billie Lou Watt. Edward Bull started constructing engines for Boulton and Watt in Cornwall in 1781. It was won by the carriage of Isaac Watt Boulton. It resulted in six convictions, including James G. Watt, Reagan's Secretary of the Interior.