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.
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.
Kilowatt-hours | Megajoules |
---|---|
0
kWh
|
0
MJ
|
1
kWh
|
3.6
MJ
|
2
kWh
|
7.2
MJ
|
3
kWh
|
10.8
MJ
|
4
kWh
|
14.4
MJ
|
5
kWh
|
18
MJ
|
6
kWh
|
21.6
MJ
|
7
kWh
|
25.2
MJ
|
8
kWh
|
28.8
MJ
|
9
kWh
|
32.4
MJ
|
10
kWh
|
36
MJ
|
11
kWh
|
39.6
MJ
|
12
kWh
|
43.2
MJ
|
13
kWh
|
46.8
MJ
|
14
kWh
|
50.4
MJ
|
15
kWh
|
54
MJ
|
16
kWh
|
57.6
MJ
|
17
kWh
|
61.2
MJ
|
18
kWh
|
64.8
MJ
|
19
kWh
|
68.4
MJ
|
20
kWh
|
72
MJ
|
21
kWh
|
75.6
MJ
|
22
kWh
|
79.2
MJ
|
23
kWh
|
82.8
MJ
|
24
kWh
|
86.4
MJ
|
25
kWh
|
90
MJ
|
26
kWh
|
93.6
MJ
|
27
kWh
|
97.2
MJ
|
28
kWh
|
100.8
MJ
|
29
kWh
|
104.4
MJ
|
30
kWh
|
108
MJ
|
31
kWh
|
111.6
MJ
|
32
kWh
|
115.2
MJ
|
33
kWh
|
118.8
MJ
|
34
kWh
|
122.4
MJ
|
35
kWh
|
126
MJ
|
36
kWh
|
129.6
MJ
|
37
kWh
|
133.2
MJ
|
38
kWh
|
136.8
MJ
|
39
kWh
|
140.4
MJ
|
40
kWh
|
144
MJ
|
41
kWh
|
147.6
MJ
|
42
kWh
|
151.2
MJ
|
43
kWh
|
154.8
MJ
|
44
kWh
|
158.4
MJ
|
45
kWh
|
162
MJ
|
46
kWh
|
165.6
MJ
|
47
kWh
|
169.2
MJ
|
48
kWh
|
172.8
MJ
|
49
kWh
|
176.4
MJ
|
50
kWh
|
180
MJ
|
51
kWh
|
183.6
MJ
|
52
kWh
|
187.2
MJ
|
53
kWh
|
190.8
MJ
|
54
kWh
|
194.4
MJ
|
55
kWh
|
198
MJ
|
56
kWh
|
201.6
MJ
|
57
kWh
|
205.2
MJ
|
58
kWh
|
208.8
MJ
|
59
kWh
|
212.4
MJ
|
60
kWh
|
216
MJ
|
61
kWh
|
219.6
MJ
|
62
kWh
|
223.2
MJ
|
63
kWh
|
226.8
MJ
|
64
kWh
|
230.4
MJ
|
65
kWh
|
234
MJ
|
66
kWh
|
237.6
MJ
|
67
kWh
|
241.2
MJ
|
68
kWh
|
244.8
MJ
|
69
kWh
|
248.4
MJ
|
70
kWh
|
252
MJ
|
71
kWh
|
255.6
MJ
|
72
kWh
|
259.2
MJ
|
73
kWh
|
262.8
MJ
|
74
kWh
|
266.4
MJ
|
75
kWh
|
270
MJ
|
76
kWh
|
273.6
MJ
|
77
kWh
|
277.2
MJ
|
78
kWh
|
280.8
MJ
|
79
kWh
|
284.4
MJ
|
80
kWh
|
288
MJ
|
81
kWh
|
291.6
MJ
|
82
kWh
|
295.2
MJ
|
83
kWh
|
298.8
MJ
|
84
kWh
|
302.4
MJ
|
85
kWh
|
306
MJ
|
86
kWh
|
309.6
MJ
|
87
kWh
|
313.2
MJ
|
88
kWh
|
316.8
MJ
|
89
kWh
|
320.4
MJ
|
90
kWh
|
324
MJ
|
91
kWh
|
327.6
MJ
|
92
kWh
|
331.2
MJ
|
93
kWh
|
334.8
MJ
|
94
kWh
|
338.4
MJ
|
95
kWh
|
342
MJ
|
96
kWh
|
345.6
MJ
|
97
kWh
|
349.2
MJ
|
98
kWh
|
352.8
MJ
|
99
kWh
|
356.4
MJ
|
100
kWh
|
360
MJ
|
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