April 2019
Intermediate to advanced
352 pages
11h 34m
English
The SI unit for energy is the joule (J). An equivalent derived unit is the watt second (W·s). Common energy quantities are usually measured in kilowatt hours (kWh). Table A.1 summarizes the units commonly used in the energy sector. Table A.2 shows the prefixes and abbreviations for energy units.
Table A.1 Conversion factors between different units of energy
| kJ | kcal | kWh | kg coal equivalent | kg oil equivalent | m3 natural gas | |
| 1 kJ (1 kJ = 1000 Ws) | 1 | 0.238 8 | 0.000 278 | 0.000 034 | 0.000 024 | 0.000 032 |
| 1 kcal | 4.186 8 | 1 | 0.001 163 | 0.000 143 | 0.000 1 | 0.000 13 |
| 1 kWh | 3 600 | 860 | 1 | 0.123 | 0.086 | 0.113 |
| 1 kg coal equivalent | 29 308 | 7 000 | 8.14 | 1 | 0.7 | 0.923 |
| 1 kg oil equivalent | 41 868 | 10 000 | 11.63 | 1.428 | 1 | 1.319 |
| m3 natural gas | 31 736 | 7 580 | 8.816 | 1.083 | 0.758 | 1 |
Table A.2 Prefixes and abbreviations
| Prefix | Abbrev. | Value | Prefix | Abbrev. | Value |
| kilo | k | 103 (thousand) | milli | m | 10−3 (thousandth) |
| mega | M | 106 (million) | micro | μ | 10−6 (millionth) |
| giga | G | 109 (billion) | nano | n | 10−9 (billionth) |
| tera | T | 1012 (trillion) | pico | p | 10−12 (trillionth) |
| peta | P | 1015 (quadrillion) | femto | f | 10−15 (quadrillionth) |
| exa | E | 1018 (quintillion) | atto | a | 10−18 (quintillionth) |
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