The kilojoule, abbreviated as kJ, is a unit of energy in the International System of Units. While it may not be as commonly recognized as calories in everyday conversation, the kilojoule is actually the standard metric unit for quantifying energy. Fascinatingly, 1 kilojoule is equivalent to 0.239 calories, making it a handy unit for converting nutritional information, especially in countries that primarily use the metric system.
Interestingly, the term “joule” is named after the English physicist James Prescott Joule, who studied the nature of heat and discovered its relationship to mechanical work. This unit has applications far beyond nutrition, including physics, chemistry, and engineering, where it measures various types of energy transformations, from kinetic to thermal. Understanding kilojoules can deepen our appreciation of energy, highlighting the intricate balances that power our world and our bodies.
A gigawatt-hour (GWh) is a unit of energy representing one billion watt-hours, or one million kilowatt-hours. To put it into perspective, a single gigawatt-hour can power approximately 750,000 homes for an hour or a modest-sized city for a few hours! This unit is commonly used in measuring the output of power stations or the amount of electricity consumed over a span.
Interestingly, the largest solar farm in the world, Noor Abu Dhabi, boasts a capacity of about 1,177 gigawatts per year, reflecting how renewable energy advancements continue to scale. As nations transition to greener power, understanding energy units like the gigawatt-hour becomes crucial in evaluating our global energy impact and future sustainability targets.
| Kilojoules | Gigawatt-hours |
|---|---|
0
kJ
|
0
GWh
|
10
kJ
|
2.77778e-9
GWh
|
20
kJ
|
5.55556e-9
GWh
|
30
kJ
|
8.33333e-9
GWh
|
40
kJ
|
1.11111e-8
GWh
|
50
kJ
|
1.38889e-8
GWh
|
60
kJ
|
1.66667e-8
GWh
|
70
kJ
|
1.94444e-8
GWh
|
80
kJ
|
2.22222e-8
GWh
|
90
kJ
|
2.5e-8
GWh
|
100
kJ
|
2.77778e-8
GWh
|
110
kJ
|
3.05556e-8
GWh
|
120
kJ
|
3.33333e-8
GWh
|
130
kJ
|
3.61111e-8
GWh
|
140
kJ
|
3.88889e-8
GWh
|
150
kJ
|
4.16667e-8
GWh
|
160
kJ
|
4.44444e-8
GWh
|
170
kJ
|
4.72222e-8
GWh
|
180
kJ
|
5e-8
GWh
|
190
kJ
|
5.27778e-8
GWh
|
200
kJ
|
5.55556e-8
GWh
|
210
kJ
|
5.83333e-8
GWh
|
220
kJ
|
6.11111e-8
GWh
|
230
kJ
|
6.38889e-8
GWh
|
240
kJ
|
6.66667e-8
GWh
|
250
kJ
|
6.94444e-8
GWh
|
260
kJ
|
7.22222e-8
GWh
|
270
kJ
|
7.5e-8
GWh
|
280
kJ
|
7.77778e-8
GWh
|
290
kJ
|
8.05556e-8
GWh
|
300
kJ
|
8.33333e-8
GWh
|
310
kJ
|
8.61111e-8
GWh
|
320
kJ
|
8.88889e-8
GWh
|
330
kJ
|
9.16667e-8
GWh
|
340
kJ
|
9.44444e-8
GWh
|
350
kJ
|
9.72222e-8
GWh
|
360
kJ
|
1e-7
GWh
|
370
kJ
|
1.02778e-7
GWh
|
380
kJ
|
1.05556e-7
GWh
|
390
kJ
|
1.08333e-7
GWh
|
400
kJ
|
1.11111e-7
GWh
|
410
kJ
|
1.13889e-7
GWh
|
420
kJ
|
1.16667e-7
GWh
|
430
kJ
|
1.19444e-7
GWh
|
440
kJ
|
1.22222e-7
GWh
|
450
kJ
|
1.25e-7
GWh
|
460
kJ
|
1.27778e-7
GWh
|
470
kJ
|
1.30556e-7
GWh
|
480
kJ
|
1.33333e-7
GWh
|
490
kJ
|
1.36111e-7
GWh
|
500
kJ
|
1.38889e-7
GWh
|
510
kJ
|
1.41667e-7
GWh
|
520
kJ
|
1.44444e-7
GWh
|
530
kJ
|
1.47222e-7
GWh
|
540
kJ
|
1.5e-7
GWh
|
550
kJ
|
1.52778e-7
GWh
|
560
kJ
|
1.55556e-7
GWh
|
570
kJ
|
1.58333e-7
GWh
|
580
kJ
|
1.61111e-7
GWh
|
590
kJ
|
1.63889e-7
GWh
|
600
kJ
|
1.66667e-7
GWh
|
610
kJ
|
1.69444e-7
GWh
|
620
kJ
|
1.72222e-7
GWh
|
630
kJ
|
1.75e-7
GWh
|
640
kJ
|
1.77778e-7
GWh
|
650
kJ
|
1.80556e-7
GWh
|
660
kJ
|
1.83333e-7
GWh
|
670
kJ
|
1.86111e-7
GWh
|
680
kJ
|
1.88889e-7
GWh
|
690
kJ
|
1.91667e-7
GWh
|
700
kJ
|
1.94444e-7
GWh
|
710
kJ
|
1.97222e-7
GWh
|
720
kJ
|
2e-7
GWh
|
730
kJ
|
2.02778e-7
GWh
|
740
kJ
|
2.05556e-7
GWh
|
750
kJ
|
2.08333e-7
GWh
|
760
kJ
|
2.11111e-7
GWh
|
770
kJ
|
2.13889e-7
GWh
|
780
kJ
|
2.16667e-7
GWh
|
790
kJ
|
2.19444e-7
GWh
|
800
kJ
|
2.22222e-7
GWh
|
810
kJ
|
2.25e-7
GWh
|
820
kJ
|
2.27778e-7
GWh
|
830
kJ
|
2.30556e-7
GWh
|
840
kJ
|
2.33333e-7
GWh
|
850
kJ
|
2.36111e-7
GWh
|
860
kJ
|
2.38889e-7
GWh
|
870
kJ
|
2.41667e-7
GWh
|
880
kJ
|
2.44444e-7
GWh
|
890
kJ
|
2.47222e-7
GWh
|
900
kJ
|
2.5e-7
GWh
|
910
kJ
|
2.52778e-7
GWh
|
920
kJ
|
2.55556e-7
GWh
|
930
kJ
|
2.58333e-7
GWh
|
940
kJ
|
2.61111e-7
GWh
|
950
kJ
|
2.63889e-7
GWh
|
960
kJ
|
2.66667e-7
GWh
|
970
kJ
|
2.69444e-7
GWh
|
980
kJ
|
2.72222e-7
GWh
|
990
kJ
|
2.75e-7
GWh
|
1000
kJ
|
2.77778e-7
GWh
|
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