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  3. If the sun has enough power to warm and light the whole earth, it must have enough power to do other things, too.【61】Can we use

If the sun has enough power to warm and light the whole earth, it must have enough power to do other things, too.【61】Can we use

admin2010-06-30  55
问题      If the sun has enough power to warm and light the whole earth, it must have enough power to do other things, too.【61】Can we use the sun’s aboundant energy to supply electricity, or at least to perform the functions which electricity or other types of power usually perform? The answer is yes.
     【62】 For example people have for many years been using the reflected heat of the sun to cook by. Solar cookers have been built with several curved mirrors reflecting the sun and focusing its heat on the cooking element. This apparatus can be used just like a gas or electric stove; it is more expensive to make but it does not need any fuel, and so costs nothing to use. Another possibility of using solar energy is in househeating.
     【63】 The form of energy we use most is electricity , and every day more is needed. But electricity has to be made, too, and to make it huge quantities of fuel are required--oil, coal, gas and nowadays even uranium.
     The question which worries everyone today is: how long will these fuels last? 【64】 Nobody knows for sure, but most experts think it will soon be difficult to obtain sufficient electricity from these sources. It is possible that the sun can make a contribution here, too.
     【65】 Solar power has already been used to produce terrific heat. In Southern France a solar furnace has been built, where temperatures reach more than 3000°Centigrade. This furnace is only used for experiments at present, but could be used to produce steam for a power station.
     So it is possible that one day in the near future we will depend on solar furnaces and power stations to provide our electrical needs. Or perhaps each home will have, a solar generator to pro vide power for lighting and heating.
【63】
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答案我们用得最多的能源形式是电能，而且用量与日俱增。但是电也需要生产，要生产电就需要大量燃料，如石油、煤、天然气，现在甚至用铀作燃料。
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