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.
The megawatt-hour (MWh) is a unit of energy that measures electricity production, consumption, or energy flow over time. It is commonly used to bill large-scale electricity consumers, such as factories or entire cities. To put it into perspective, one megawatt-hour can power about 330 homes for an hour or a single home for 330 hours! In the realm of renewable energy, just one megawatt-hour of wind energy can offset over 1,100 pounds of carbon dioxide emissions—a significant environmental benefit.
Moreover, the world’s energy needs are so vast that in 2022, global electricity consumption soared to over 26,000 terawatt-hours (TWh), where one terawatt-hour equates to one million megawatt-hours. This highlights how crucial units like the MWh are in understanding and managing our energy use and impact.
Kilojoules | Megawatt-hours |
---|---|
0
kJ
|
0
MWh
|
10
kJ
|
2.77778e-6
MWh
|
20
kJ
|
5.55556e-6
MWh
|
30
kJ
|
8.33333e-6
MWh
|
40
kJ
|
1.11111e-5
MWh
|
50
kJ
|
1.38889e-5
MWh
|
60
kJ
|
1.66667e-5
MWh
|
70
kJ
|
1.94444e-5
MWh
|
80
kJ
|
2.22222e-5
MWh
|
90
kJ
|
0.000025
MWh
|
100
kJ
|
2.77778e-5
MWh
|
110
kJ
|
3.05556e-5
MWh
|
120
kJ
|
3.33333e-5
MWh
|
130
kJ
|
3.61111e-5
MWh
|
140
kJ
|
3.88889e-5
MWh
|
150
kJ
|
4.16667e-5
MWh
|
160
kJ
|
4.44444e-5
MWh
|
170
kJ
|
4.72222e-5
MWh
|
180
kJ
|
0.00005
MWh
|
190
kJ
|
5.27778e-5
MWh
|
200
kJ
|
5.55556e-5
MWh
|
210
kJ
|
5.83333e-5
MWh
|
220
kJ
|
6.11111e-5
MWh
|
230
kJ
|
6.38889e-5
MWh
|
240
kJ
|
6.66667e-5
MWh
|
250
kJ
|
6.94444e-5
MWh
|
260
kJ
|
7.22222e-5
MWh
|
270
kJ
|
0.000075
MWh
|
280
kJ
|
7.77778e-5
MWh
|
290
kJ
|
8.05556e-5
MWh
|
300
kJ
|
8.33333e-5
MWh
|
310
kJ
|
8.61111e-5
MWh
|
320
kJ
|
8.88889e-5
MWh
|
330
kJ
|
9.16667e-5
MWh
|
340
kJ
|
9.44444e-5
MWh
|
350
kJ
|
9.72222e-5
MWh
|
360
kJ
|
0.0001
MWh
|
370
kJ
|
0.000102778
MWh
|
380
kJ
|
0.000105556
MWh
|
390
kJ
|
0.000108333
MWh
|
400
kJ
|
0.000111111
MWh
|
410
kJ
|
0.000113889
MWh
|
420
kJ
|
0.000116667
MWh
|
430
kJ
|
0.000119444
MWh
|
440
kJ
|
0.000122222
MWh
|
450
kJ
|
0.000125
MWh
|
460
kJ
|
0.000127778
MWh
|
470
kJ
|
0.000130556
MWh
|
480
kJ
|
0.000133333
MWh
|
490
kJ
|
0.000136111
MWh
|
500
kJ
|
0.000138889
MWh
|
510
kJ
|
0.000141667
MWh
|
520
kJ
|
0.000144444
MWh
|
530
kJ
|
0.000147222
MWh
|
540
kJ
|
0.00015
MWh
|
550
kJ
|
0.000152778
MWh
|
560
kJ
|
0.000155556
MWh
|
570
kJ
|
0.000158333
MWh
|
580
kJ
|
0.000161111
MWh
|
590
kJ
|
0.000163889
MWh
|
600
kJ
|
0.000166667
MWh
|
610
kJ
|
0.000169444
MWh
|
620
kJ
|
0.000172222
MWh
|
630
kJ
|
0.000175
MWh
|
640
kJ
|
0.000177778
MWh
|
650
kJ
|
0.000180556
MWh
|
660
kJ
|
0.000183333
MWh
|
670
kJ
|
0.000186111
MWh
|
680
kJ
|
0.000188889
MWh
|
690
kJ
|
0.000191667
MWh
|
700
kJ
|
0.000194444
MWh
|
710
kJ
|
0.000197222
MWh
|
720
kJ
|
0.0002
MWh
|
730
kJ
|
0.000202778
MWh
|
740
kJ
|
0.000205556
MWh
|
750
kJ
|
0.000208333
MWh
|
760
kJ
|
0.000211111
MWh
|
770
kJ
|
0.000213889
MWh
|
780
kJ
|
0.000216667
MWh
|
790
kJ
|
0.000219444
MWh
|
800
kJ
|
0.000222222
MWh
|
810
kJ
|
0.000225
MWh
|
820
kJ
|
0.000227778
MWh
|
830
kJ
|
0.000230556
MWh
|
840
kJ
|
0.000233333
MWh
|
850
kJ
|
0.000236111
MWh
|
860
kJ
|
0.000238889
MWh
|
870
kJ
|
0.000241667
MWh
|
880
kJ
|
0.000244444
MWh
|
890
kJ
|
0.000247222
MWh
|
900
kJ
|
0.00025
MWh
|
910
kJ
|
0.000252778
MWh
|
920
kJ
|
0.000255556
MWh
|
930
kJ
|
0.000258333
MWh
|
940
kJ
|
0.000261111
MWh
|
950
kJ
|
0.000263889
MWh
|
960
kJ
|
0.000266667
MWh
|
970
kJ
|
0.000269444
MWh
|
980
kJ
|
0.000272222
MWh
|
990
kJ
|
0.000275
MWh
|
1000
kJ
|
0.000277778
MWh
|
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