Definition
The SI unit of power. Power is the rate at which work is done, or (equivalently) the rate at which energy is expended. One watt is equal to a power rate of one joule of work per second of time. This unit is used both in mechanics and in electricity, so it links the mechanical and electrical units to one another. In mechanical terms, one watt equals about 0.001 341 02 horsepower (hp) or 0.737 562 foot-pound per second (lbf/s). In electrical terms, one watt is the power produced by a current of one ampere flowing through an electric potential of one volt. The name of the unit honors James Watt (1736-1819), the British engineer whose improvements to the steam engine are often credited with igniting the Industrial Revolution.
Concept Hierarchy
Broader Concepts 1
Current Concept
Narrower Concepts 65
Bar Litre per Second
bar.L.s-1
View details
Bar Cubic Metre per Second
F92
View details
British Thermal Unit (international Definition) per Hour
0112/2///62720#UAA116
View details
British Thermal Unit (international Definition) per Second
0112/2///62720#UAA121
View details
Erg per Second
A63
View details
Exajoule per Second
EJ.s-1
View details
Exawatt
EW
View details
Foot Pound Force per Hour
K15
View details
Foot Pound Force per Minute
[ft_i].[lbf_av].min-1
View details
Foot Pound Force per Second
0112/2///62720#UAA446
View details
Gigajoule per Hour
P16
View details
Gigajoule per Second
GJ/s
View details
Gigawatt
A90
View details
Horsepower
[HP]
View details
Boiler Horsepower
K42
View details
Horsepower (brake)
HP{brake}
View details
Horsepower (electric)
K43
View details
Horsepower (water)
0112/2///62720#UAA538
View details
Horsepower (metric)
0112/2///62720#UAA534
View details
Hectopascal Litre per Second
F93
View details
Hectopascal Cubic Metre per Second
hPa.m3.s-1
View details
Joule per Day
P17
View details
Joule per Hour
P16
View details
Joule per Minute
P15
View details
Joule per Second
P14
View details
Kilo British Thermal Unit (international Definition) per Hour
kBtu{IT}/h
View details
Kilocalorie per Minute
K54
View details
Kilocalorie per Second
kcal.s-1
View details
Kilo Gram Force Metre per Second
B39
View details
Kilojoule per Day
0112/2///62720#UAB450
View details
Kilojoule per Hour
P20
View details
Kilojoule per Minute
kJ/min
View details
Kilojoule per Second
kJ/s
View details
Kilowatt
KWT
View details
Mega British Thermal Unit (international Definition) per Hour
MBtu{IT}/h
View details
Megajoule per Hour
P16
View details
Megajoule per Second
MJ.s-1
View details
Megapascal Litre per Second
F97
View details
Megapascal Cubic Metre per Second
0112/2///62720#UAA219
View details
Megawatt
MW
View details
Microjoule per Second
μJ/s
View details
Microwatt
μW
View details
Millibar Litre per Second
F95
View details
Millibar Cubic Metre per Second
0112/2///62720#UAA327
View details
Millijoule per Second
mJ.s-1
View details
Milliwatt
mW
View details
Nanojoule per Second
nJ/s
View details
Nanowatt
0112/2///62720#UAA910
View details
Pascal Litre per Second
F99
View details
Pascal Cubic Metre per Second
Pa.m3.s-1
View details
Pferdestaerke
N12
View details
Psi Cubic Inch per Second
[psi].[in_i]3.s-1
View details
Psi Litre per Second
0112/2///62720#UAA704
View details
Psi Cubic Metre per Second
K89
View details
Psi Cubic Yard per Second
K90
View details
Petajoule per Second
0112/2///62720#UAB514
View details
Petawatt
PW
View details
Picojoule per Second
0112/2///62720#UAB508
View details
Picowatt
0112/2///62720#UAA935
View details
Planck Power
planckpower
View details
Therm Us per Hour
thm{US}/h
View details
Ton of Refrigeration
TOR
View details
Terajoule per Second
TJ.s-1
View details
Terawatt
TW
View details
Terawatt Hour per Year
TW·h/a
View details
Concept Information
IRI
https://vocab.sentier.dev/units/unit/W
Notation
WTT
Status
Accepted