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watt
Symbol:  W 
Category:  Power (Heat flow) 
SI Equivalent:  1 W
Dimension ML2T-3 
System:  SI 
 
Notes
Named in honor of the Scottish inventor James Watt (1736-1819), the watt is the unit of power in the SI system. It is equal to 1 joule of work produced per second.
Convert     W  
1 W =
Power (Heat flow)
  Symbol Unit Name
10×106  aW  abwatt (emu of power) 
3.41214  Btu (IT)/h  British thermal unit (IT) per hour 
5.6869×10-2  Btu (IT)/min  British thermal unit (IT) per minute 
9.47817×10-4  Btu (IT)/s  British thermal unit (IT) per second 
3.41443  Btu (therm.)/h  British thermal unit (therm.) per hour 
5.69071×10-2  Btu (therm.)/min  British thermal unit (therm.) per minute 
9.48452×10-4  Btu (therm.)/s  British thermal unit (therm.) per second 
859.858  cal (IT)/h  calorie (IT) per hour 
14.331  cal (IT)/min  calorie (IT) per minute 
0.238849  cal (IT)/s  calorie (IT) per second 
616.438  cal (therm.)/h  calorie (therm.) per hour 
14.3403  cal (therm.)/min  calorie (therm.) per minute 
0.239006  cal (therm.)/s  calorie (therm.) per second 
1.35962×10-3  cv, HP  cheval-vapeur (horsepower) 
10×106  dyn-cm/s  dyne-centimeter per second 
10×106  erg/s  erg per second 
2655.22  ft-lbf/h  foot-pound force per hour 
44.2537  ft-lbf/min  foot-pound force per minute 
0.737562  ft-lbf/s  foot-pound force per second 
23.7304  ft-pdl/s  foot-poundal per second 
1.34102×10-3  HP  horsepower (550 ft-lbf/s) 
1.01942×10-4  HP  horsepower (boiler) 
1.34102×10-3  BHP, hp  horsepower (British) 
1.35962×10-3  cv, HP  horsepower (cheval-vapeur) 
1.35962×10-3  HP  horsepower (metric) 
1.34041×10-3  HP  horsepower (water) 
0.101972  kgf-m/s  kilogram force-meter per second 
1×10-3  kW  kilowatt 
1.01972×10-2    prony 
2.54927×10-4  CTR (UK)  ton (refrigeration, UK) 
2.84349×10-4  CTR (US)  ton (refrigeration, US) 
VA  volt-ampere 
0.99981  W  watt (int. mean) 
0.999835  W  watt (int. US) 
Glossary
3D Scanners

A white paper to assist in the evaluation of 3D scanning hardware solutions.

Mechanical Engineers Outlook

Guide for those interested in becoming a mechanical engineer. Includes qualifications, pay, and job duties.

Selecting the Right 3D Printer

Discover how to choose the right 3D printer for your needs and the key performance attributes to consider.

STEM Career Outlook

Wages, employment opportunities, and growth projections for STEM jobs.