The watt, a unit of power in the International System of Units, is named after James Watt, the Scottish inventor who vastly improved the efficiency of steam engines in the 18th century. One watt is equivalent to one joule of energy per second, signifying how much energy is transferred or converted. Interestingly, a single watt is roughly the amount of power used by a human heart, pumping about 80 milliliters of blood per beat with a resting heart rate.
In our technology-driven society, watts are pivotal in understanding the energy consumption of electrical devices. For instance, a typical LED light bulb uses about 10 watts, significantly less than an incandescent bulb, highlighting the watt’s role in energy conservation. Moreover, the watt powers our world: everything from the brightness of light bulbs to the performance of supercomputers is measured in watts, underlining its importance in both everyday life and cutting-edge technology.
Horsepower (metric) is a fascinating unit of measurement that dates back to the 18th century, when James Watt, the developer of the steam engine, sought to compare the power output of his engines to that of draft horses. The metric horsepower is defined as the amount of power required to lift a 75-kilogram mass one meter vertically in one second, which is equivalent to 735.5 watts. Interestingly, this unit persists in many regions, particularly in the automotive industry, where it is used to convey the strength of vehicle engines. Despite advancements in engine technology, the image of raw horsepower continues to captivate our imagination, embodying both history and precision engineering.
| Watts | Horsepower (metric) |
|---|---|
0
W
|
0
PS
|
10
W
|
0.0135962
PS
|
20
W
|
0.0271924
PS
|
30
W
|
0.0407886
PS
|
40
W
|
0.0543849
PS
|
50
W
|
0.0679811
PS
|
60
W
|
0.0815773
PS
|
70
W
|
0.0951735
PS
|
80
W
|
0.10877
PS
|
90
W
|
0.122366
PS
|
100
W
|
0.135962
PS
|
110
W
|
0.149558
PS
|
120
W
|
0.163155
PS
|
130
W
|
0.176751
PS
|
140
W
|
0.190347
PS
|
150
W
|
0.203943
PS
|
160
W
|
0.217539
PS
|
170
W
|
0.231136
PS
|
180
W
|
0.244732
PS
|
190
W
|
0.258328
PS
|
200
W
|
0.271924
PS
|
210
W
|
0.285521
PS
|
220
W
|
0.299117
PS
|
230
W
|
0.312713
PS
|
240
W
|
0.326309
PS
|
250
W
|
0.339905
PS
|
260
W
|
0.353502
PS
|
270
W
|
0.367098
PS
|
280
W
|
0.380694
PS
|
290
W
|
0.39429
PS
|
300
W
|
0.407886
PS
|
310
W
|
0.421483
PS
|
320
W
|
0.435079
PS
|
330
W
|
0.448675
PS
|
340
W
|
0.462271
PS
|
350
W
|
0.475868
PS
|
360
W
|
0.489464
PS
|
370
W
|
0.50306
PS
|
380
W
|
0.516656
PS
|
390
W
|
0.530252
PS
|
400
W
|
0.543849
PS
|
410
W
|
0.557445
PS
|
420
W
|
0.571041
PS
|
430
W
|
0.584637
PS
|
440
W
|
0.598234
PS
|
450
W
|
0.61183
PS
|
460
W
|
0.625426
PS
|
470
W
|
0.639022
PS
|
480
W
|
0.652618
PS
|
490
W
|
0.666215
PS
|
500
W
|
0.679811
PS
|
510
W
|
0.693407
PS
|
520
W
|
0.707003
PS
|
530
W
|
0.720599
PS
|
540
W
|
0.734196
PS
|
550
W
|
0.747792
PS
|
560
W
|
0.761388
PS
|
570
W
|
0.774984
PS
|
580
W
|
0.788581
PS
|
590
W
|
0.802177
PS
|
600
W
|
0.815773
PS
|
610
W
|
0.829369
PS
|
620
W
|
0.842965
PS
|
630
W
|
0.856562
PS
|
640
W
|
0.870158
PS
|
650
W
|
0.883754
PS
|
660
W
|
0.89735
PS
|
670
W
|
0.910946
PS
|
680
W
|
0.924543
PS
|
690
W
|
0.938139
PS
|
700
W
|
0.951735
PS
|
710
W
|
0.965331
PS
|
720
W
|
0.978928
PS
|
730
W
|
0.992524
PS
|
740
W
|
1.00612
PS
|
750
W
|
1.01972
PS
|
760
W
|
1.03331
PS
|
770
W
|
1.04691
PS
|
780
W
|
1.0605
PS
|
790
W
|
1.0741
PS
|
800
W
|
1.0877
PS
|
810
W
|
1.10129
PS
|
820
W
|
1.11489
PS
|
830
W
|
1.12849
PS
|
840
W
|
1.14208
PS
|
850
W
|
1.15568
PS
|
860
W
|
1.16927
PS
|
870
W
|
1.18287
PS
|
880
W
|
1.19647
PS
|
890
W
|
1.21006
PS
|
900
W
|
1.22366
PS
|
910
W
|
1.23726
PS
|
920
W
|
1.25085
PS
|
930
W
|
1.26445
PS
|
940
W
|
1.27804
PS
|
950
W
|
1.29164
PS
|
960
W
|
1.30524
PS
|
970
W
|
1.31883
PS
|
980
W
|
1.33243
PS
|
990
W
|
1.34603
PS
|
1000
W
|
1.35962
PS
|
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