The milliwatt-hour (mWh) might seem like a small unit of energy, but when you consider the burgeoning demand for portable technology, it plays a vital role in everyday electronics. This unit is commonly used to measure the energy capacity of small batteries, such as those found in smartphones, earbuds, and other miniature devices. Interestingly, even though a single milliwatt-hour is just a thousandth of a watt-hour, the overall efficiency of devices is often improved by optimizing such seemingly tiny units of energy.
For context, when you binge your favorite series on a compact digital device, you can thank the precise calculation of mWh for maximizing battery life without sacrificing performance. As technology advances, the milliwatt-hour will continue to dictate innovations in energy efficiency, making our devices smarter and more sustainable.
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.
Milliwatt-hours | Kilojoules |
---|---|
0
mWh
|
0
kJ
|
1000
mWh
|
3.6
kJ
|
2000
mWh
|
7.2
kJ
|
3000
mWh
|
10.8
kJ
|
4000
mWh
|
14.4
kJ
|
5000
mWh
|
18
kJ
|
6000
mWh
|
21.6
kJ
|
7000
mWh
|
25.2
kJ
|
8000
mWh
|
28.8
kJ
|
9000
mWh
|
32.4
kJ
|
10000
mWh
|
36
kJ
|
11000
mWh
|
39.6
kJ
|
12000
mWh
|
43.2
kJ
|
13000
mWh
|
46.8
kJ
|
14000
mWh
|
50.4
kJ
|
15000
mWh
|
54
kJ
|
16000
mWh
|
57.6
kJ
|
17000
mWh
|
61.2
kJ
|
18000
mWh
|
64.8
kJ
|
19000
mWh
|
68.4
kJ
|
20000
mWh
|
72
kJ
|
21000
mWh
|
75.6
kJ
|
22000
mWh
|
79.2
kJ
|
23000
mWh
|
82.8
kJ
|
24000
mWh
|
86.4
kJ
|
25000
mWh
|
90
kJ
|
26000
mWh
|
93.6
kJ
|
27000
mWh
|
97.2
kJ
|
28000
mWh
|
100.8
kJ
|
29000
mWh
|
104.4
kJ
|
30000
mWh
|
108
kJ
|
31000
mWh
|
111.6
kJ
|
32000
mWh
|
115.2
kJ
|
33000
mWh
|
118.8
kJ
|
34000
mWh
|
122.4
kJ
|
35000
mWh
|
126
kJ
|
36000
mWh
|
129.6
kJ
|
37000
mWh
|
133.2
kJ
|
38000
mWh
|
136.8
kJ
|
39000
mWh
|
140.4
kJ
|
40000
mWh
|
144
kJ
|
41000
mWh
|
147.6
kJ
|
42000
mWh
|
151.2
kJ
|
43000
mWh
|
154.8
kJ
|
44000
mWh
|
158.4
kJ
|
45000
mWh
|
162
kJ
|
46000
mWh
|
165.6
kJ
|
47000
mWh
|
169.2
kJ
|
48000
mWh
|
172.8
kJ
|
49000
mWh
|
176.4
kJ
|
50000
mWh
|
180
kJ
|
51000
mWh
|
183.6
kJ
|
52000
mWh
|
187.2
kJ
|
53000
mWh
|
190.8
kJ
|
54000
mWh
|
194.4
kJ
|
55000
mWh
|
198
kJ
|
56000
mWh
|
201.6
kJ
|
57000
mWh
|
205.2
kJ
|
58000
mWh
|
208.8
kJ
|
59000
mWh
|
212.4
kJ
|
60000
mWh
|
216
kJ
|
61000
mWh
|
219.6
kJ
|
62000
mWh
|
223.2
kJ
|
63000
mWh
|
226.8
kJ
|
64000
mWh
|
230.4
kJ
|
65000
mWh
|
234
kJ
|
66000
mWh
|
237.6
kJ
|
67000
mWh
|
241.2
kJ
|
68000
mWh
|
244.8
kJ
|
69000
mWh
|
248.4
kJ
|
70000
mWh
|
252
kJ
|
71000
mWh
|
255.6
kJ
|
72000
mWh
|
259.2
kJ
|
73000
mWh
|
262.8
kJ
|
74000
mWh
|
266.4
kJ
|
75000
mWh
|
270
kJ
|
76000
mWh
|
273.6
kJ
|
77000
mWh
|
277.2
kJ
|
78000
mWh
|
280.8
kJ
|
79000
mWh
|
284.4
kJ
|
80000
mWh
|
288
kJ
|
81000
mWh
|
291.6
kJ
|
82000
mWh
|
295.2
kJ
|
83000
mWh
|
298.8
kJ
|
84000
mWh
|
302.4
kJ
|
85000
mWh
|
306
kJ
|
86000
mWh
|
309.6
kJ
|
87000
mWh
|
313.2
kJ
|
88000
mWh
|
316.8
kJ
|
89000
mWh
|
320.4
kJ
|
90000
mWh
|
324
kJ
|
91000
mWh
|
327.6
kJ
|
92000
mWh
|
331.2
kJ
|
93000
mWh
|
334.8
kJ
|
94000
mWh
|
338.4
kJ
|
95000
mWh
|
342
kJ
|
96000
mWh
|
345.6
kJ
|
97000
mWh
|
349.2
kJ
|
98000
mWh
|
352.8
kJ
|
99000
mWh
|
356.4
kJ
|
100000
mWh
|
360
kJ
|
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