See also Constants
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|---|---|
| 1kWh | 3.6 × 106 J |
| 1 hp (horsepower) | 746 W |
| 1 Btu | 1.055 kJ |
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| 1 year | 8765.8 hours |
| 1 hour | 3600 sec |
| 1 year | 3.157 x 107 sec |
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| 1 kWh/m2 | 1 Peak Sun Hour |
| 1 kWh/m2 | 3.6 MJ/m2 |
| 1 kWh/m2 | 0.0116 Langley |
| 1 kWh/m2 | 860 cal/m2 |
| 1 MJ/m2/day | 0.01157 kW/m2 |
| 1 kW/m2 | 100 mW/cm2 |
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| 1 ft2 | 0.093 m2 |
1 m2 is approximately 10 ft2
Standard SI prefixes
| Symbol | Prefix | Factor |
|---|---|---|
| T | tera | 1012 |
| G | giga | 109 |
| M | mega | 106 |
| k | kilo | 103 |
| c | centi | 10-2 |
| m | milli | 10-3 |
| μ * | micron | 10-6 |
| n | nano | 10-9 |
| p | pico | 10-12 |
* occasionally um is used instead of μm for microns