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 calorie, commonly associated with food energy, originally measured heat in physics. One calorie is the amount of heat needed to raise the temperature of 1 gram of water by 1 degree Celsius. Despite what food packaging might suggest, when we count calories, we are typically referring to kilocalories, which equals 1,000 of these small calories. This means that when you see a snack label stating it’s 100 calories, it’s actually 100 kilocalories, or 100,000 calories in scientific terms!
Interestingly, the calorie became a popular unit due to its early use in nutrition studies and its role in determining food’s energy content. This is crucial, as it helps in planning and maintaining balanced diets and understanding energy expenditure for health and fitness.
| Watt-minutes | Calories |
|---|---|
0
Wm
|
0
cal
|
10
Wm
|
143.40344
cal
|
20
Wm
|
286.80688
cal
|
30
Wm
|
430.21033
cal
|
40
Wm
|
573.61377
cal
|
50
Wm
|
717.01721
cal
|
60
Wm
|
860.42065
cal
|
70
Wm
|
1003.82409
cal
|
80
Wm
|
1147.22753
cal
|
90
Wm
|
1290.63098
cal
|
100
Wm
|
1434.03442
cal
|
110
Wm
|
1577.43786
cal
|
120
Wm
|
1720.8413
cal
|
130
Wm
|
1864.24474
cal
|
140
Wm
|
2007.64818
cal
|
150
Wm
|
2151.05163
cal
|
160
Wm
|
2294.45507
cal
|
170
Wm
|
2437.85851
cal
|
180
Wm
|
2581.26195
cal
|
190
Wm
|
2724.66539
cal
|
200
Wm
|
2868.06883
cal
|
210
Wm
|
3011.47228
cal
|
220
Wm
|
3154.87572
cal
|
230
Wm
|
3298.27916
cal
|
240
Wm
|
3441.6826
cal
|
250
Wm
|
3585.08604
cal
|
260
Wm
|
3728.48948
cal
|
270
Wm
|
3871.89293
cal
|
280
Wm
|
4015.29637
cal
|
290
Wm
|
4158.69981
cal
|
300
Wm
|
4302.10325
cal
|
310
Wm
|
4445.50669
cal
|
320
Wm
|
4588.91013
cal
|
330
Wm
|
4732.31358
cal
|
340
Wm
|
4875.71702
cal
|
350
Wm
|
5019.12046
cal
|
360
Wm
|
5162.5239
cal
|
370
Wm
|
5305.92734
cal
|
380
Wm
|
5449.33078
cal
|
390
Wm
|
5592.73423
cal
|
400
Wm
|
5736.13767
cal
|
410
Wm
|
5879.54111
cal
|
420
Wm
|
6022.94455
cal
|
430
Wm
|
6166.34799
cal
|
440
Wm
|
6309.75143
cal
|
450
Wm
|
6453.15488
cal
|
460
Wm
|
6596.55832
cal
|
470
Wm
|
6739.96176
cal
|
480
Wm
|
6883.3652
cal
|
490
Wm
|
7026.76864
cal
|
500
Wm
|
7170.17208
cal
|
510
Wm
|
7313.57553
cal
|
520
Wm
|
7456.97897
cal
|
530
Wm
|
7600.38241
cal
|
540
Wm
|
7743.78585
cal
|
550
Wm
|
7887.18929
cal
|
560
Wm
|
8030.59273
cal
|
570
Wm
|
8173.99618
cal
|
580
Wm
|
8317.39962
cal
|
590
Wm
|
8460.80306
cal
|
600
Wm
|
8604.2065
cal
|
610
Wm
|
8747.60994
cal
|
620
Wm
|
8891.01338
cal
|
630
Wm
|
9034.41683
cal
|
640
Wm
|
9177.82027
cal
|
650
Wm
|
9321.22371
cal
|
660
Wm
|
9464.62715
cal
|
670
Wm
|
9608.03059
cal
|
680
Wm
|
9751.43403
cal
|
690
Wm
|
9894.83748
cal
|
700
Wm
|
10038.24092
cal
|
710
Wm
|
10181.64436
cal
|
720
Wm
|
10325.0478
cal
|
730
Wm
|
10468.45124
cal
|
740
Wm
|
10611.85468
cal
|
750
Wm
|
10755.25813
cal
|
760
Wm
|
10898.66157
cal
|
770
Wm
|
11042.06501
cal
|
780
Wm
|
11185.46845
cal
|
790
Wm
|
11328.87189
cal
|
800
Wm
|
11472.27533
cal
|
810
Wm
|
11615.67878
cal
|
820
Wm
|
11759.08222
cal
|
830
Wm
|
11902.48566
cal
|
840
Wm
|
12045.8891
cal
|
850
Wm
|
12189.29254
cal
|
860
Wm
|
12332.69598
cal
|
870
Wm
|
12476.09943
cal
|
880
Wm
|
12619.50287
cal
|
890
Wm
|
12762.90631
cal
|
900
Wm
|
12906.30975
cal
|
910
Wm
|
13049.71319
cal
|
920
Wm
|
13193.11663
cal
|
930
Wm
|
13336.52008
cal
|
940
Wm
|
13479.92352
cal
|
950
Wm
|
13623.32696
cal
|
960
Wm
|
13766.7304
cal
|
970
Wm
|
13910.13384
cal
|
980
Wm
|
14053.53728
cal
|
990
Wm
|
14196.94073
cal
|
1000
Wm
|
14340.34417
cal
|
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