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.
A megajoule, equivalent to one million joules, is a versatile unit of energy that may be more integral to your daily life than you realize. For instance, the energy stored in a liter of gasoline is approximately 34.2 megajoules, which is why this measure often underpins discussions in energy industries. Interestingly, the lightning bolt that splits the sky during a thunderstorm releases about 500 megajoules, highlighting the immense power nature can unleash in mere seconds.
The megajoule also plays a pivotal role in fields like physics and engineering, especially in calculating the energy output of various processes. For example, modern fusion experiments and some space missions use megajoules to quantify energy needs and outputs. This essential unit connects the dots between cutting-edge technology and natural phenomena, providing insights into the world’s invisible energies.
| Watt-hours | Megajoules |
|---|---|
0
Wh
|
0
MJ
|
10
Wh
|
0.036
MJ
|
20
Wh
|
0.072
MJ
|
30
Wh
|
0.108
MJ
|
40
Wh
|
0.144
MJ
|
50
Wh
|
0.18
MJ
|
60
Wh
|
0.216
MJ
|
70
Wh
|
0.252
MJ
|
80
Wh
|
0.288
MJ
|
90
Wh
|
0.324
MJ
|
100
Wh
|
0.36
MJ
|
110
Wh
|
0.396
MJ
|
120
Wh
|
0.432
MJ
|
130
Wh
|
0.468
MJ
|
140
Wh
|
0.504
MJ
|
150
Wh
|
0.54
MJ
|
160
Wh
|
0.576
MJ
|
170
Wh
|
0.612
MJ
|
180
Wh
|
0.648
MJ
|
190
Wh
|
0.684
MJ
|
200
Wh
|
0.72
MJ
|
210
Wh
|
0.756
MJ
|
220
Wh
|
0.792
MJ
|
230
Wh
|
0.828
MJ
|
240
Wh
|
0.864
MJ
|
250
Wh
|
0.9
MJ
|
260
Wh
|
0.936
MJ
|
270
Wh
|
0.972
MJ
|
280
Wh
|
1.008
MJ
|
290
Wh
|
1.044
MJ
|
300
Wh
|
1.08
MJ
|
310
Wh
|
1.116
MJ
|
320
Wh
|
1.152
MJ
|
330
Wh
|
1.188
MJ
|
340
Wh
|
1.224
MJ
|
350
Wh
|
1.26
MJ
|
360
Wh
|
1.296
MJ
|
370
Wh
|
1.332
MJ
|
380
Wh
|
1.368
MJ
|
390
Wh
|
1.404
MJ
|
400
Wh
|
1.44
MJ
|
410
Wh
|
1.476
MJ
|
420
Wh
|
1.512
MJ
|
430
Wh
|
1.548
MJ
|
440
Wh
|
1.584
MJ
|
450
Wh
|
1.62
MJ
|
460
Wh
|
1.656
MJ
|
470
Wh
|
1.692
MJ
|
480
Wh
|
1.728
MJ
|
490
Wh
|
1.764
MJ
|
500
Wh
|
1.8
MJ
|
510
Wh
|
1.836
MJ
|
520
Wh
|
1.872
MJ
|
530
Wh
|
1.908
MJ
|
540
Wh
|
1.944
MJ
|
550
Wh
|
1.98
MJ
|
560
Wh
|
2.016
MJ
|
570
Wh
|
2.052
MJ
|
580
Wh
|
2.088
MJ
|
590
Wh
|
2.124
MJ
|
600
Wh
|
2.16
MJ
|
610
Wh
|
2.196
MJ
|
620
Wh
|
2.232
MJ
|
630
Wh
|
2.268
MJ
|
640
Wh
|
2.304
MJ
|
650
Wh
|
2.34
MJ
|
660
Wh
|
2.376
MJ
|
670
Wh
|
2.412
MJ
|
680
Wh
|
2.448
MJ
|
690
Wh
|
2.484
MJ
|
700
Wh
|
2.52
MJ
|
710
Wh
|
2.556
MJ
|
720
Wh
|
2.592
MJ
|
730
Wh
|
2.628
MJ
|
740
Wh
|
2.664
MJ
|
750
Wh
|
2.7
MJ
|
760
Wh
|
2.736
MJ
|
770
Wh
|
2.772
MJ
|
780
Wh
|
2.808
MJ
|
790
Wh
|
2.844
MJ
|
800
Wh
|
2.88
MJ
|
810
Wh
|
2.916
MJ
|
820
Wh
|
2.952
MJ
|
830
Wh
|
2.988
MJ
|
840
Wh
|
3.024
MJ
|
850
Wh
|
3.06
MJ
|
860
Wh
|
3.096
MJ
|
870
Wh
|
3.132
MJ
|
880
Wh
|
3.168
MJ
|
890
Wh
|
3.204
MJ
|
900
Wh
|
3.24
MJ
|
910
Wh
|
3.276
MJ
|
920
Wh
|
3.312
MJ
|
930
Wh
|
3.348
MJ
|
940
Wh
|
3.384
MJ
|
950
Wh
|
3.42
MJ
|
960
Wh
|
3.456
MJ
|
970
Wh
|
3.492
MJ
|
980
Wh
|
3.528
MJ
|
990
Wh
|
3.564
MJ
|
1000
Wh
|
3.6
MJ
|
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