Watt
= Watt
{title2=$\mathrm W=\mathrm{J/s}$}
{wiki}
The <watt> is the <SI> unit of <power>, one <joule> per second. <Joule heating> at $12.5\,\mathrm W$ transfers $125\,\mathrm J$ of <energy> over a <time> of $10\,\mathrm s$ if that <power> stays constant. <University Physics Volume 2 by Samuel J. Ling and others/9.5 Electrical Energy and Power>[Ling, Sanny and Moebs, §9.5: power in watts]{ref}.