The watt-second is a unit of energy that represents the amount of work done when a power of one watt is sustained for one second. This unit is a direct way to visualize energy transfer in everyday activities. Interestingly, while it may sound abstract, this unit can be directly applied to understand how quick appliances like LED lights or small electronic devices consume energy. For example, a modern LED bulb that consumes 10 watts of power will use 10 watt-seconds of energy every second it is on.
While commonly overshadowed by the more familiar joule, the watt-second is essentially equivalent to one joule. Its simplicity in denoting power over time makes it a cornerstone concept in physics and engineering, where it is applied to calculate specific energy transfers and efficiency in varied systems. Exploring this unit helps bridge the gap between theoretical energy calculations and practical everyday energy use.
The watt-hour (Wh) is a unit of energy that measures the amount of electricity consumed or generated over time. It is the energy equivalent to one watt of power consumed for one hour. While electricity bills commonly display kilowatt-hours (kWh), understanding watt-hours can give you clearer insights into the energy efficiency of your household. For instance, a 60-watt incandescent light bulb running for one hour uses 60 watt-hours of electricity, while an energy-efficient LED bulb might only use around 10 watt-hours for the same illumination.
Interestingly, the concept of the watt-hour helps in comprehending renewable energy systems. Solar panels, for example, are rated in watts, but their output over time is often expressed in watt-hours or kilowatt-hours. Knowing this can help you assess how much energy your solar array could generate or your battery storage can hold, emphasizing the real value of alternative energy sources.
Watt-seconds | Watt-hours |
---|---|
0
Ws
|
0
Wh
|
100
Ws
|
0.0277778
Wh
|
200
Ws
|
0.0555556
Wh
|
300
Ws
|
0.0833333
Wh
|
400
Ws
|
0.111111
Wh
|
500
Ws
|
0.138889
Wh
|
600
Ws
|
0.166667
Wh
|
700
Ws
|
0.194444
Wh
|
800
Ws
|
0.222222
Wh
|
900
Ws
|
0.25
Wh
|
1000
Ws
|
0.277778
Wh
|
1100
Ws
|
0.305556
Wh
|
1200
Ws
|
0.333333
Wh
|
1300
Ws
|
0.361111
Wh
|
1400
Ws
|
0.388889
Wh
|
1500
Ws
|
0.416667
Wh
|
1600
Ws
|
0.444444
Wh
|
1700
Ws
|
0.472222
Wh
|
1800
Ws
|
0.5
Wh
|
1900
Ws
|
0.527778
Wh
|
2000
Ws
|
0.555556
Wh
|
2100
Ws
|
0.583333
Wh
|
2200
Ws
|
0.611111
Wh
|
2300
Ws
|
0.638889
Wh
|
2400
Ws
|
0.666667
Wh
|
2500
Ws
|
0.694444
Wh
|
2600
Ws
|
0.722222
Wh
|
2700
Ws
|
0.75
Wh
|
2800
Ws
|
0.777778
Wh
|
2900
Ws
|
0.805556
Wh
|
3000
Ws
|
0.833333
Wh
|
3100
Ws
|
0.861111
Wh
|
3200
Ws
|
0.888889
Wh
|
3300
Ws
|
0.916667
Wh
|
3400
Ws
|
0.944444
Wh
|
3500
Ws
|
0.972222
Wh
|
3600
Ws
|
1
Wh
|
3700
Ws
|
1.02778
Wh
|
3800
Ws
|
1.05556
Wh
|
3900
Ws
|
1.08333
Wh
|
4000
Ws
|
1.11111
Wh
|
4100
Ws
|
1.13889
Wh
|
4200
Ws
|
1.16667
Wh
|
4300
Ws
|
1.19444
Wh
|
4400
Ws
|
1.22222
Wh
|
4500
Ws
|
1.25
Wh
|
4600
Ws
|
1.27778
Wh
|
4700
Ws
|
1.30556
Wh
|
4800
Ws
|
1.33333
Wh
|
4900
Ws
|
1.36111
Wh
|
5000
Ws
|
1.38889
Wh
|
5100
Ws
|
1.41667
Wh
|
5200
Ws
|
1.44444
Wh
|
5300
Ws
|
1.47222
Wh
|
5400
Ws
|
1.5
Wh
|
5500
Ws
|
1.52778
Wh
|
5600
Ws
|
1.55556
Wh
|
5700
Ws
|
1.58333
Wh
|
5800
Ws
|
1.61111
Wh
|
5900
Ws
|
1.63889
Wh
|
6000
Ws
|
1.66667
Wh
|
6100
Ws
|
1.69444
Wh
|
6200
Ws
|
1.72222
Wh
|
6300
Ws
|
1.75
Wh
|
6400
Ws
|
1.77778
Wh
|
6500
Ws
|
1.80556
Wh
|
6600
Ws
|
1.83333
Wh
|
6700
Ws
|
1.86111
Wh
|
6800
Ws
|
1.88889
Wh
|
6900
Ws
|
1.91667
Wh
|
7000
Ws
|
1.94444
Wh
|
7100
Ws
|
1.97222
Wh
|
7200
Ws
|
2
Wh
|
7300
Ws
|
2.02778
Wh
|
7400
Ws
|
2.05556
Wh
|
7500
Ws
|
2.08333
Wh
|
7600
Ws
|
2.11111
Wh
|
7700
Ws
|
2.13889
Wh
|
7800
Ws
|
2.16667
Wh
|
7900
Ws
|
2.19444
Wh
|
8000
Ws
|
2.22222
Wh
|
8100
Ws
|
2.25
Wh
|
8200
Ws
|
2.27778
Wh
|
8300
Ws
|
2.30556
Wh
|
8400
Ws
|
2.33333
Wh
|
8500
Ws
|
2.36111
Wh
|
8600
Ws
|
2.38889
Wh
|
8700
Ws
|
2.41667
Wh
|
8800
Ws
|
2.44444
Wh
|
8900
Ws
|
2.47222
Wh
|
9000
Ws
|
2.5
Wh
|
9100
Ws
|
2.52778
Wh
|
9200
Ws
|
2.55556
Wh
|
9300
Ws
|
2.58333
Wh
|
9400
Ws
|
2.61111
Wh
|
9500
Ws
|
2.63889
Wh
|
9600
Ws
|
2.66667
Wh
|
9700
Ws
|
2.69444
Wh
|
9800
Ws
|
2.72222
Wh
|
9900
Ws
|
2.75
Wh
|
10000
Ws
|
2.77778
Wh
|
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