The kilowatt-hour (kWh) is a unit of energy that represents the amount of energy consumed or produced. Although commonly associated with electric bills, it has fascinating real-world applications. For example, one kWh can power a 100-watt incandescent light bulb for 10 hours or a modern energy-efficient LED bulb for around 50 hours. Interestingly, the kWh is not just for electricity—it’s also used in renewable energy systems to measure solar and wind power production efficiencies.
Beyond its practical uses, kilowatt-hours reveal intriguing insights into our energy consumption patterns. For instance, the average U.S. home consumes about 877 kWh per month, providing a benchmark for households exploring energy-saving measures. The kWh also serves as a universal language in global energy markets, standardizing costs and outputs across international borders.
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.
Kilowatt-hours | Watt-hours |
---|---|
0
kWh
|
0
Wh
|
1
kWh
|
1000
Wh
|
2
kWh
|
2000
Wh
|
3
kWh
|
3000
Wh
|
4
kWh
|
4000
Wh
|
5
kWh
|
5000
Wh
|
6
kWh
|
6000
Wh
|
7
kWh
|
7000
Wh
|
8
kWh
|
8000
Wh
|
9
kWh
|
9000
Wh
|
10
kWh
|
10000
Wh
|
11
kWh
|
11000
Wh
|
12
kWh
|
12000
Wh
|
13
kWh
|
13000
Wh
|
14
kWh
|
14000
Wh
|
15
kWh
|
15000
Wh
|
16
kWh
|
16000
Wh
|
17
kWh
|
17000
Wh
|
18
kWh
|
18000
Wh
|
19
kWh
|
19000
Wh
|
20
kWh
|
20000
Wh
|
21
kWh
|
21000
Wh
|
22
kWh
|
22000
Wh
|
23
kWh
|
23000
Wh
|
24
kWh
|
24000
Wh
|
25
kWh
|
25000
Wh
|
26
kWh
|
26000
Wh
|
27
kWh
|
27000
Wh
|
28
kWh
|
28000
Wh
|
29
kWh
|
29000
Wh
|
30
kWh
|
30000
Wh
|
31
kWh
|
31000
Wh
|
32
kWh
|
32000
Wh
|
33
kWh
|
33000
Wh
|
34
kWh
|
34000
Wh
|
35
kWh
|
35000
Wh
|
36
kWh
|
36000
Wh
|
37
kWh
|
37000
Wh
|
38
kWh
|
38000
Wh
|
39
kWh
|
39000
Wh
|
40
kWh
|
40000
Wh
|
41
kWh
|
41000
Wh
|
42
kWh
|
42000
Wh
|
43
kWh
|
43000
Wh
|
44
kWh
|
44000
Wh
|
45
kWh
|
45000
Wh
|
46
kWh
|
46000
Wh
|
47
kWh
|
47000
Wh
|
48
kWh
|
48000
Wh
|
49
kWh
|
49000
Wh
|
50
kWh
|
50000
Wh
|
51
kWh
|
51000
Wh
|
52
kWh
|
52000
Wh
|
53
kWh
|
53000
Wh
|
54
kWh
|
54000
Wh
|
55
kWh
|
55000
Wh
|
56
kWh
|
56000
Wh
|
57
kWh
|
57000
Wh
|
58
kWh
|
58000
Wh
|
59
kWh
|
59000
Wh
|
60
kWh
|
60000
Wh
|
61
kWh
|
61000
Wh
|
62
kWh
|
62000
Wh
|
63
kWh
|
63000
Wh
|
64
kWh
|
64000
Wh
|
65
kWh
|
65000
Wh
|
66
kWh
|
66000
Wh
|
67
kWh
|
67000
Wh
|
68
kWh
|
68000
Wh
|
69
kWh
|
69000
Wh
|
70
kWh
|
70000
Wh
|
71
kWh
|
71000
Wh
|
72
kWh
|
72000
Wh
|
73
kWh
|
73000
Wh
|
74
kWh
|
74000
Wh
|
75
kWh
|
75000
Wh
|
76
kWh
|
76000
Wh
|
77
kWh
|
77000
Wh
|
78
kWh
|
78000
Wh
|
79
kWh
|
79000
Wh
|
80
kWh
|
80000
Wh
|
81
kWh
|
81000
Wh
|
82
kWh
|
82000
Wh
|
83
kWh
|
83000
Wh
|
84
kWh
|
84000
Wh
|
85
kWh
|
85000
Wh
|
86
kWh
|
86000
Wh
|
87
kWh
|
87000
Wh
|
88
kWh
|
88000
Wh
|
89
kWh
|
89000
Wh
|
90
kWh
|
90000
Wh
|
91
kWh
|
91000
Wh
|
92
kWh
|
92000
Wh
|
93
kWh
|
93000
Wh
|
94
kWh
|
94000
Wh
|
95
kWh
|
95000
Wh
|
96
kWh
|
96000
Wh
|
97
kWh
|
97000
Wh
|
98
kWh
|
98000
Wh
|
99
kWh
|
99000
Wh
|
100
kWh
|
100000
Wh
|
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