Alternative energy sources

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ALTERNATIVE ENERGY student

Questions 9-13
Alternative Energy Sources

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5 Wind power is the most efficient form of alternative energy.
6 Wave energy can be derived from a number of sources.
7 Alternative energy sources serve several purposes.
8 Fossil fuels are needed in at least one of these alternative energy sources.

Questions 9-13

Complete the sentences.
Choose NO MORE THAN THREE WORDS from the passage for each answer.
By using alternative energy sources, we can cut the 9 that are produced by current power sources.
In addition to fossil fuels and atom splitting, we presently use 10 as part of our power source.
Renewable energy called biomass is produced from 11
The renewable energy that comes from within the earth is called 12 .
One of the reasons that fuel cells are not widely used is the 13 of manufacturing.

Alternative Energy Sources

A number of different energy sources are used every day. Where does this energy come from? Burning of fossil fuel is a main energy source. Sources other than this fossil fuel are known as alternative energy sources and there are several of them being used every day.
The water used by whitewater rafters has a tremendous amount of energy. That water energy can be harnessed to perform work by using waterwheels. Running or falling water turns the wheel. The turning wheel spins an axle which can be attached to machinery to do various work. In a mill the waterwheel turns and a big stone grinds grain. In a sawmill waterwheels turn the axle and a blade cuts wood. Finally, in a hydroelectric plant the running or falling water spins a generator to create electricity.
Not only does water spin a wheel, but wind can do so as well. Windmills work in the same manner as a waterwheel. For many years, windmills were usually used mainly for milling grain, pumping water, or both. Today, though, all of that has changed.

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