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!
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.
| Watt-minutes | Watt-hours |
|---|---|
0
Wm
|
0
Wh
|
10
Wm
|
0.166667
Wh
|
20
Wm
|
0.333333
Wh
|
30
Wm
|
0.5
Wh
|
40
Wm
|
0.666667
Wh
|
50
Wm
|
0.833333
Wh
|
60
Wm
|
1
Wh
|
70
Wm
|
1.16667
Wh
|
80
Wm
|
1.33333
Wh
|
90
Wm
|
1.5
Wh
|
100
Wm
|
1.66667
Wh
|
110
Wm
|
1.83333
Wh
|
120
Wm
|
2
Wh
|
130
Wm
|
2.16667
Wh
|
140
Wm
|
2.33333
Wh
|
150
Wm
|
2.5
Wh
|
160
Wm
|
2.66667
Wh
|
170
Wm
|
2.83333
Wh
|
180
Wm
|
3
Wh
|
190
Wm
|
3.16667
Wh
|
200
Wm
|
3.33333
Wh
|
210
Wm
|
3.5
Wh
|
220
Wm
|
3.66667
Wh
|
230
Wm
|
3.83333
Wh
|
240
Wm
|
4
Wh
|
250
Wm
|
4.16667
Wh
|
260
Wm
|
4.33333
Wh
|
270
Wm
|
4.5
Wh
|
280
Wm
|
4.66667
Wh
|
290
Wm
|
4.83333
Wh
|
300
Wm
|
5
Wh
|
310
Wm
|
5.16667
Wh
|
320
Wm
|
5.33333
Wh
|
330
Wm
|
5.5
Wh
|
340
Wm
|
5.66667
Wh
|
350
Wm
|
5.83333
Wh
|
360
Wm
|
6
Wh
|
370
Wm
|
6.16667
Wh
|
380
Wm
|
6.33333
Wh
|
390
Wm
|
6.5
Wh
|
400
Wm
|
6.66667
Wh
|
410
Wm
|
6.83333
Wh
|
420
Wm
|
7
Wh
|
430
Wm
|
7.16667
Wh
|
440
Wm
|
7.33333
Wh
|
450
Wm
|
7.5
Wh
|
460
Wm
|
7.66667
Wh
|
470
Wm
|
7.83333
Wh
|
480
Wm
|
8
Wh
|
490
Wm
|
8.16667
Wh
|
500
Wm
|
8.33333
Wh
|
510
Wm
|
8.5
Wh
|
520
Wm
|
8.66667
Wh
|
530
Wm
|
8.83333
Wh
|
540
Wm
|
9
Wh
|
550
Wm
|
9.16667
Wh
|
560
Wm
|
9.33333
Wh
|
570
Wm
|
9.5
Wh
|
580
Wm
|
9.66667
Wh
|
590
Wm
|
9.83333
Wh
|
600
Wm
|
10
Wh
|
610
Wm
|
10.16667
Wh
|
620
Wm
|
10.33333
Wh
|
630
Wm
|
10.5
Wh
|
640
Wm
|
10.66667
Wh
|
650
Wm
|
10.83333
Wh
|
660
Wm
|
11
Wh
|
670
Wm
|
11.16667
Wh
|
680
Wm
|
11.33333
Wh
|
690
Wm
|
11.5
Wh
|
700
Wm
|
11.66667
Wh
|
710
Wm
|
11.83333
Wh
|
720
Wm
|
12
Wh
|
730
Wm
|
12.16667
Wh
|
740
Wm
|
12.33333
Wh
|
750
Wm
|
12.5
Wh
|
760
Wm
|
12.66667
Wh
|
770
Wm
|
12.83333
Wh
|
780
Wm
|
13
Wh
|
790
Wm
|
13.16667
Wh
|
800
Wm
|
13.33333
Wh
|
810
Wm
|
13.5
Wh
|
820
Wm
|
13.66667
Wh
|
830
Wm
|
13.83333
Wh
|
840
Wm
|
14
Wh
|
850
Wm
|
14.16667
Wh
|
860
Wm
|
14.33333
Wh
|
870
Wm
|
14.5
Wh
|
880
Wm
|
14.66667
Wh
|
890
Wm
|
14.83333
Wh
|
900
Wm
|
15
Wh
|
910
Wm
|
15.16667
Wh
|
920
Wm
|
15.33333
Wh
|
930
Wm
|
15.5
Wh
|
940
Wm
|
15.66667
Wh
|
950
Wm
|
15.83333
Wh
|
960
Wm
|
16
Wh
|
970
Wm
|
16.16667
Wh
|
980
Wm
|
16.33333
Wh
|
990
Wm
|
16.5
Wh
|
1000
Wm
|
16.66667
Wh
|
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