This article has been reviewed by the following Topic Editor: Tom Lawrence
SI multiples of watt-hour
Multiple
Name
Symbol
Multiple
Name
Symbol
100
watt-hour
W·h
101
decawatt-hour
daW·h
10–1
deciwatt-hour
dW·h
102
hectowatt-hour
hW·h
10–2
centiwatt-hour
cW·h
103
kilowatt-hour
kW·h
10–3
milliwatt-hour
mW·h
106
megawatt-hour
MW·h
10–6
microwatt-hour
µW·h
109
gigawatt-hour
GW·h
10–9
nanowatt-hour
nW·h
1012
terawatt-hour
TW·h
10–12
picowatt-hour
pW·h
1015
petawatt-hour
PW·h
10–15
femtowatt-hour
fW·h
1018
exawatt-hour
EW·h
10–18
attowatt-hour
aW·h
1021
zettawatt-hour
ZW·h
10–21
zeptowatt-hour
zW·h
1024
yottawatt-hour
YW·h
10–24
yoctowatt-hour
yW·h
Definition
The watt-hour (symbol W·h) is a unit of energy commonly used to measure electricity. One watt-hour is the amount of electrical energy equivalent to a one-watt load drawing power for one hour. For example, a 100-watt light bulb uses 100 watt-hours of energy every hour. The is commonly used in the form of the kilowatt-hour, which is 1,000 watt-hours. The watt-hour It is not an SI unit, despite being based on the watt. The SI unit of energy is the joule (J), equal to one watt-second.
In the inch-pounds unit system, a watt-hour is equivalent to 3.412 Btu.
Cutler Cleveland (Lead Author);Tom Lawrence (Topic Editor) "Watt-hour". In: Encyclopedia of Earth. Eds. Cutler J. Cleveland (Washington, D.C.: Environmental Information Coalition, National Council for Science and the Environment). [First published in the Encyclopedia of Earth January 6, 2007; Last revised Date January 6, 2007; Retrieved May 26, 2012 <http://www.eoearth.org/article/Watt-hour>
The Author
Editor-in-Chief
The Encyclopedia of Earth Cutler J. Cleveland is the founding Editor-in-Chief of the Encyclopedia of Earth. Dr. Cleveland is currently a Professor in the Department of Geography and Environment at Boston University, with joint appointments in the Center for Energy and Environmental Studies and the Pardee Center for the Study of the Longer Range Future. He also is a Senior Fellow at the National Council for Science and the Environment in Washington D.C. Dr. Cleveland is als ... (Full Bio)
SI multiples of watt-hour
Multiple
Name
Symbol
Multiple
Name
Symbol
100
watt-hour
W·h
101
decawatt-hour
daW·h
10–1
deciwatt-hour
dW·h
102
hectowatt-hour
hW·h
10–2
centiwatt-hour
cW·h
103
kilowatt-hour
kW·h
10–3
milliwatt-hour
mW·h
106
megawatt-hour
MW·h
10–6
microwatt-hour
µW·h
109
gigawatt-hour
GW·h
10–9
nanowatt-hour
nW·h
1012
terawatt-hour
TW·h
10–12
picowatt-hour
pW·h
1015
petawatt-hour
PW·h
10–15
femtowatt-hour
fW·h
1018
exawatt-hour
EW·h
10–18
attowatt-hour
aW·h
1021
zettawatt-hour
ZW·h
10–21
zeptowatt-hour
zW·h
1024
yottawatt-hour
YW·h
10–24
yoctowatt-hour
yW·h
Definition
The watt-hour (symbol W·h) is a unit of energy commonly used to measure electricity. One watt-hour is the amount of electrical energy equivalent to a one-watt load drawing power for one hour. For example, a 100-watt light bulb uses 100 watt-hours of energy every hour. The is commonly used in the form of the kilowatt-hour, which is 1,000 watt-hours. The watt-hour It is not an SI unit, despite being based on the watt. The SI unit of energy is the joule (J), equal to one watt-second.
In the inch-pounds unit system, a watt-hour is equivalent to 3.412 Btu.
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