Named after the English physicist James Prescott Joule, the joule is a unit of energy in the International System of Units. A single joule represents the energy transferred when a force of one newton acts over a meter. To put it in everyday terms, the energy used to lift a small apple one meter off the ground is approximately one joule. Interestingly, the joule is also the energy released in one second by a current of one ampere through a resistance of one ohm, showcasing its versatility across both mechanical and electrical domains.
While joules measure energy, they can also power curiosity. For instance, the daily recommended caloric intake for an average adult translates to roughly 8,700,000 joules. This highlights the joule’s role not only in physics but also in our nutrition and daily energy consumption, offering a glimpse into the complex interplay between energy, food, and our bodies.
The kilowatt-hour (kWh) is a unit of energy that represents the amount of energy consumed or produced. Although commonly associated with electric bills, it has fascinating real-world applications. For example, one kWh can power a 100-watt incandescent light bulb for 10 hours or a modern energy-efficient LED bulb for around 50 hours. Interestingly, the kWh is not just for electricity—it’s also used in renewable energy systems to measure solar and wind power production efficiencies.
Beyond its practical uses, kilowatt-hours reveal intriguing insights into our energy consumption patterns. For instance, the average U.S. home consumes about 877 kWh per month, providing a benchmark for households exploring energy-saving measures. The kWh also serves as a universal language in global energy markets, standardizing costs and outputs across international borders.
Joules | Kilowatt-hours |
---|---|
0
J
|
0
kWh
|
100
J
|
2.77778e-5
kWh
|
200
J
|
5.55556e-5
kWh
|
300
J
|
8.33333e-5
kWh
|
400
J
|
0.000111111
kWh
|
500
J
|
0.000138889
kWh
|
600
J
|
0.000166667
kWh
|
700
J
|
0.000194444
kWh
|
800
J
|
0.000222222
kWh
|
900
J
|
0.00025
kWh
|
1000
J
|
0.000277778
kWh
|
1100
J
|
0.000305556
kWh
|
1200
J
|
0.000333333
kWh
|
1300
J
|
0.000361111
kWh
|
1400
J
|
0.000388889
kWh
|
1500
J
|
0.000416667
kWh
|
1600
J
|
0.000444444
kWh
|
1700
J
|
0.000472222
kWh
|
1800
J
|
0.0005
kWh
|
1900
J
|
0.000527778
kWh
|
2000
J
|
0.000555556
kWh
|
2100
J
|
0.000583333
kWh
|
2200
J
|
0.000611111
kWh
|
2300
J
|
0.000638889
kWh
|
2400
J
|
0.000666667
kWh
|
2500
J
|
0.000694444
kWh
|
2600
J
|
0.000722222
kWh
|
2700
J
|
0.00075
kWh
|
2800
J
|
0.000777778
kWh
|
2900
J
|
0.000805556
kWh
|
3000
J
|
0.000833333
kWh
|
3100
J
|
0.000861111
kWh
|
3200
J
|
0.000888889
kWh
|
3300
J
|
0.000916667
kWh
|
3400
J
|
0.000944444
kWh
|
3500
J
|
0.000972222
kWh
|
3600
J
|
0.001
kWh
|
3700
J
|
0.00102778
kWh
|
3800
J
|
0.00105556
kWh
|
3900
J
|
0.00108333
kWh
|
4000
J
|
0.00111111
kWh
|
4100
J
|
0.00113889
kWh
|
4200
J
|
0.00116667
kWh
|
4300
J
|
0.00119444
kWh
|
4400
J
|
0.00122222
kWh
|
4500
J
|
0.00125
kWh
|
4600
J
|
0.00127778
kWh
|
4700
J
|
0.00130556
kWh
|
4800
J
|
0.00133333
kWh
|
4900
J
|
0.00136111
kWh
|
5000
J
|
0.00138889
kWh
|
5100
J
|
0.00141667
kWh
|
5200
J
|
0.00144444
kWh
|
5300
J
|
0.00147222
kWh
|
5400
J
|
0.0015
kWh
|
5500
J
|
0.00152778
kWh
|
5600
J
|
0.00155556
kWh
|
5700
J
|
0.00158333
kWh
|
5800
J
|
0.00161111
kWh
|
5900
J
|
0.00163889
kWh
|
6000
J
|
0.00166667
kWh
|
6100
J
|
0.00169444
kWh
|
6200
J
|
0.00172222
kWh
|
6300
J
|
0.00175
kWh
|
6400
J
|
0.00177778
kWh
|
6500
J
|
0.00180556
kWh
|
6600
J
|
0.00183333
kWh
|
6700
J
|
0.00186111
kWh
|
6800
J
|
0.00188889
kWh
|
6900
J
|
0.00191667
kWh
|
7000
J
|
0.00194444
kWh
|
7100
J
|
0.00197222
kWh
|
7200
J
|
0.002
kWh
|
7300
J
|
0.00202778
kWh
|
7400
J
|
0.00205556
kWh
|
7500
J
|
0.00208333
kWh
|
7600
J
|
0.00211111
kWh
|
7700
J
|
0.00213889
kWh
|
7800
J
|
0.00216667
kWh
|
7900
J
|
0.00219444
kWh
|
8000
J
|
0.00222222
kWh
|
8100
J
|
0.00225
kWh
|
8200
J
|
0.00227778
kWh
|
8300
J
|
0.00230556
kWh
|
8400
J
|
0.00233333
kWh
|
8500
J
|
0.00236111
kWh
|
8600
J
|
0.00238889
kWh
|
8700
J
|
0.00241667
kWh
|
8800
J
|
0.00244444
kWh
|
8900
J
|
0.00247222
kWh
|
9000
J
|
0.0025
kWh
|
9100
J
|
0.00252778
kWh
|
9200
J
|
0.00255556
kWh
|
9300
J
|
0.00258333
kWh
|
9400
J
|
0.00261111
kWh
|
9500
J
|
0.00263889
kWh
|
9600
J
|
0.00266667
kWh
|
9700
J
|
0.00269444
kWh
|
9800
J
|
0.00272222
kWh
|
9900
J
|
0.00275
kWh
|
10000
J
|
0.00277778
kWh
|
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