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 watt-minute is a lesser-known unit of energy, yet it plays a significant role in understanding everyday energy consumption. It is equivalent to 60 joules and is simply the amount of energy produced or consumed by a power of one watt over one minute. Although not commonly used in everyday measurements, watt-minutes can be instrumental in more precise energy calculations, such as for electrical appliances or industrial equipment, providing insights between larger units like kilowatt-hours and smaller units like joules.
Intriguingly, it takes roughly 15 watt-minutes to charge a modern smartphone for one minute of talk time. This highlights how even small units can offer a clearer perspective on our energy usage, encouraging us to be more mindful of our energy habits!
Kilojoules | Watt-minutes |
---|---|
0
kJ
|
0
Wm
|
10
kJ
|
166.66667
Wm
|
20
kJ
|
333.33333
Wm
|
30
kJ
|
500
Wm
|
40
kJ
|
666.66667
Wm
|
50
kJ
|
833.33333
Wm
|
60
kJ
|
1000
Wm
|
70
kJ
|
1166.66667
Wm
|
80
kJ
|
1333.33333
Wm
|
90
kJ
|
1500
Wm
|
100
kJ
|
1666.66667
Wm
|
110
kJ
|
1833.33333
Wm
|
120
kJ
|
2000
Wm
|
130
kJ
|
2166.66667
Wm
|
140
kJ
|
2333.33333
Wm
|
150
kJ
|
2500
Wm
|
160
kJ
|
2666.66667
Wm
|
170
kJ
|
2833.33333
Wm
|
180
kJ
|
3000
Wm
|
190
kJ
|
3166.66667
Wm
|
200
kJ
|
3333.33333
Wm
|
210
kJ
|
3500
Wm
|
220
kJ
|
3666.66667
Wm
|
230
kJ
|
3833.33333
Wm
|
240
kJ
|
4000
Wm
|
250
kJ
|
4166.66667
Wm
|
260
kJ
|
4333.33333
Wm
|
270
kJ
|
4500
Wm
|
280
kJ
|
4666.66667
Wm
|
290
kJ
|
4833.33333
Wm
|
300
kJ
|
5000
Wm
|
310
kJ
|
5166.66667
Wm
|
320
kJ
|
5333.33333
Wm
|
330
kJ
|
5500
Wm
|
340
kJ
|
5666.66667
Wm
|
350
kJ
|
5833.33333
Wm
|
360
kJ
|
6000
Wm
|
370
kJ
|
6166.66667
Wm
|
380
kJ
|
6333.33333
Wm
|
390
kJ
|
6500
Wm
|
400
kJ
|
6666.66667
Wm
|
410
kJ
|
6833.33333
Wm
|
420
kJ
|
7000
Wm
|
430
kJ
|
7166.66667
Wm
|
440
kJ
|
7333.33333
Wm
|
450
kJ
|
7500
Wm
|
460
kJ
|
7666.66667
Wm
|
470
kJ
|
7833.33333
Wm
|
480
kJ
|
8000
Wm
|
490
kJ
|
8166.66667
Wm
|
500
kJ
|
8333.33333
Wm
|
510
kJ
|
8500
Wm
|
520
kJ
|
8666.66667
Wm
|
530
kJ
|
8833.33333
Wm
|
540
kJ
|
9000
Wm
|
550
kJ
|
9166.66667
Wm
|
560
kJ
|
9333.33333
Wm
|
570
kJ
|
9500
Wm
|
580
kJ
|
9666.66667
Wm
|
590
kJ
|
9833.33333
Wm
|
600
kJ
|
10000
Wm
|
610
kJ
|
10166.66667
Wm
|
620
kJ
|
10333.33333
Wm
|
630
kJ
|
10500
Wm
|
640
kJ
|
10666.66667
Wm
|
650
kJ
|
10833.33333
Wm
|
660
kJ
|
11000
Wm
|
670
kJ
|
11166.66667
Wm
|
680
kJ
|
11333.33333
Wm
|
690
kJ
|
11500
Wm
|
700
kJ
|
11666.66667
Wm
|
710
kJ
|
11833.33333
Wm
|
720
kJ
|
12000
Wm
|
730
kJ
|
12166.66667
Wm
|
740
kJ
|
12333.33333
Wm
|
750
kJ
|
12500
Wm
|
760
kJ
|
12666.66667
Wm
|
770
kJ
|
12833.33333
Wm
|
780
kJ
|
13000
Wm
|
790
kJ
|
13166.66667
Wm
|
800
kJ
|
13333.33333
Wm
|
810
kJ
|
13500
Wm
|
820
kJ
|
13666.66667
Wm
|
830
kJ
|
13833.33333
Wm
|
840
kJ
|
14000
Wm
|
850
kJ
|
14166.66667
Wm
|
860
kJ
|
14333.33333
Wm
|
870
kJ
|
14500
Wm
|
880
kJ
|
14666.66667
Wm
|
890
kJ
|
14833.33333
Wm
|
900
kJ
|
15000
Wm
|
910
kJ
|
15166.66667
Wm
|
920
kJ
|
15333.33333
Wm
|
930
kJ
|
15500
Wm
|
940
kJ
|
15666.66667
Wm
|
950
kJ
|
15833.33333
Wm
|
960
kJ
|
16000
Wm
|
970
kJ
|
16166.66667
Wm
|
980
kJ
|
16333.33333
Wm
|
990
kJ
|
16500
Wm
|
1000
kJ
|
16666.66667
Wm
|
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