– SOLAR ENERGY –
Most of the energy we consume comes directly or indirectly from the sun. In 1972, man consumed 90 trillion horsepower hours of energy. During the same year, the sun emitted 1.5 million trillion horsepower hours of sunlight on the planet.
Only a small fraction of this natural force (40 billion kilowatts) is converted by green plants into all the food and wood that grows on the earth. Over hundreds of thousands of years this vegetation is eventually converted into fossil fuels like coal and oil. Because of the length of time which is required to produce fossil fuels, it would be more feasible to employ solar radiations directly to help 1 meet our energy needs.
Presently solar energy can be used to stretch our limited supplies of fossil fuels. Experiments have already shown that we can heat a house, heat water, air condition buildings, cook food, and produce electricity with solar energy.
Scientists have even converted an automobile to run on batteries which are charged by solar cells. In the future, solar energy may be one of our main sources of energy.
Earh’s Energy Budget
SCALE OF SOLAR ENERGY
1. Line 1, to ‘consume’ has several dictionary meanings.
Which is the meaning in this passage?
a) To do away with completely, to destroy.
b) To eat or drink, especially in great quantity.
c) To use up.
2. Line 3, ‘During the same year’ refers to …………
3. Line 3, ’emitted’ means ………………
4. Which of the following does ‘this natural force’ (lines 4-5) refer to?
a) The 90 trillion horsepower hours of energy consumed by man.
b) The 1.5 million trillion horsepower hours of sunlight.
c) The natural force of green plants.
d) None of the above is correct.
5. Which statement is true?
a) It would be most practical if we could get some solar energy directly to meet our energy needs because we require too mu n time to produce fossil fuels.
b) It would be most practical if we could get some solar energy directly to meet our energy needs; therefore, we require so much time to produce fossil fuels.
c) We require a lot of time to produce fossi! fueis; therefore, it would be most practical if we could get some solar energy directly to help meet our energy needs.
(a) and (c) are correct.