Publication Laka-library:
Facts about energy (1982)
| Author | IAEA |
| Date | March 1982 |
| Classification | 6.01.0.20/41 (IMPORTANCE WORLDWIDE) |
| Front | 
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From the publication:
The Need for Energy Energy is an essential element of our civilization. A million years ago primitive man used only 6300 kilo joules (kJ or 1500 kilocalories)* a day, derived from the food he ate. A hundred thousand years ago our hunting ancestors had learned to make fire to cook their food and to warm themselves and used four times as much energy (the equivalent of 25 000 kilojoules). By the fifteenth century medieval man using draught-animals, windmills and water-wheels, and a little coal, was already consuming nearly twenty times as much energy (120000 kilojoules). By 1875 the steam-engine put 340 000 kilojoules a day at the disposal of industrial man in England. Today's technological man in the USA uses ea. 1000 000 kilojoules a day, or one hundred and fifty times as much as primitive man, about one third of it in the form of electricity. * The scientific term kilojoule has replaced the commonly used kilocalories. 1 kilojoule (kJ) = 0,24 kilocalories (kcal). To heat up 1 litre of water from 20°C to 100°C requires about 335 kilojoules.
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