| 单词 | solar energy |
| 释义 | solar energy The electromagnetic energy radiated from the sun. The tiny proportion (about 5 × 10-10 of the total) that falls on the earth is indicated by the solar constant. The total quantity of solar energy falling on the earth in one year is about 4 × 1018 J, whereas the total annual energy consumption of the earth's inhabitants is only some 3 × 1014 J. The sun, therefore, could provide all the energy needed. The direct ways of making use of solar energy can be divided into thermal methods (see solar heating) and nonthermal methods (see solar cell) |
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