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Measuring Energy


 


Measuring Energy

Units of Energy

  • British Horsepower (hp)
    British horsepower is the power needed to raise 550 lb. one foot in one second.
  • British Thermal Unit (Btu)
    A Btu is the energy needed to raise the temperature of one pound of water from 60 degrees F to 61 degrees F.
  • Calorie (cal)
    A calorie is the amount of energy needed to raise the temperature of one gram of water by one degree Celsius from 14.5 degrees C to 15.5 degrees C.
  • Erg
    The amount of energy needed to move one gram through one cm with an acceleration of one cm per second per second.
  • Joule (J)
    A Joule is the amount of energy needed to move a mass of one kilogram through one metre with an acceleration of one metre per second per second.
  • Kilowatt Hour (k Wh)
    The Kilowatt hour is the energy expended when one Kilowatt is available for one hour.
  • Metric Horsepower
    Metric Horsepower is the power needed to raise 75 Kg one metre in one second.
  • Watt (W)
    The Watt is the power provided when one Joule is used for one second.
Converting Horsepower to Kilowatt Hours and Kilowatt Hours to Horsepower
To convert Hp to KW or KW to Hp find the number that you wish to convert in the centre column then read its equiv. in the appropriate table.
hp
k W
1.3410
2.6820
4.0231
5.3641
6.7051
8.0461
9.3871
10.728
12.069
20.115
33.526
46.936
60.346
73.756
87.166
100.58
113.99
127.40
1
2
3
4
5
6
7
8
9
15
25
35
45
55
65
75
85
95
0.7457
1.4914
2.2371
2.9828
3.7285
4.4742
5.2199
5.9656
6.7113
11.186
18.643
26.100
33.557
41.014
48.471
55.928
63.385
70.842
Converting Joules to Calories and Calories to Joules

To convert J to Cal or Cal to J find the number that you wish to convert in the centre column then read its equiv. in the appropriate table.

J
cal
4.1855
8.3710
12.557
16.742
20.928
25.113
29.299
33.484
37.670
62.783
104.64
146.49
188.35
230.20
272.06
313.91
355.77
397.62
1
2
3
4
5
6
7
8
9
15
25
35
45
55
65
75
85
95
0.2389
0.4777
0.7165
0.9554
1.1942
1.4331
1.6719
1.9108
2.1496
3.5827
5.9712
8.3596
10.748
13.137
15.525
17.914
20.302
22.690

 

 

 


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