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Photovoltaic power plants produce electricity from sunlight. [#permalink]
11 May 2005, 15:08
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12. Photovoltaic power plants produce electricity from sunlight. As a result of astonishing recent technological advances, the cost of producing electric power at photovoltaic power plants, allowing for both construction and operating costs, is one-tenth of what it was 20 years ago, whereas the corresponding cost for traditional plants, which burn fossil fuels, has increased. Thus, photovoltaic power plants offer a less expensive approach to meeting demand for electricity than do traditional power plants.
The conclusion of the argument is properly drawn if which one of the following is assumed?
(A) The cost of producing electric power at traditional plants has increased over the past 20 years.
(B) Twenty years ago, traditional power plants were producing 10 times more electric power than were photovoltaic plants.
(C) None of the recent technological advances in producing electric power at photovoltaic plants can be applied to producing power at traditional plants.
(D) Twenty years ago, the cost of producing electric power at photovoltaic plants was less than 20 times the cost of producing power at traditional plants.
(E) The cost of producing electric power at photovoltaic plants is expected to decrease further, while the cost of producing power at traditional plants is not expected to decrease.
Between B and D, D is straight forward. But B also seems to be fine with the following reasoning.
Someone please clarify.
20 yrs ago Assuming for $100, P (Photovoltaic ) were producing x power. For the same amount T (traditional) were producing 10 times that is 10x power.
now as the cost of producing power from P has reducing 10 times, i.e for $100 10x power can be generated. However from the assumption T costs have increased, i.e for $100 now <10x power can be produced, assume 9x.
I will go for C. I don't think B and D are acceptable because one can't be sure the amount of the increase in the cost of traditional plants.
C because even if the cost of traditional plants increased and the new technology were applicable to the burning of fossil fuels, it will still be possible for the procedure to turn out less expensive than it was 20 years ago.
Can you please elaborate on d.im still not very clear.
do we have to show that the cost of producing electric power at photovoltaic plants has remained lesser than that of producing power at traditional plants throughout-that is 20 years before as is explained in d and the rest in the question stem.
Isnt it possible that though the cost of photovoltaic PP was 1/10 of traditional PP, the cost otherwise may not neccesarily be lesser?perhaps earlier they were cheaper and now are 1/10 of the original cost(not compared with traditional PP)
D is the best answer imo, however it would fit question better if opereational costs of regular PPs 'has increased significantly' instead of simply 'has increased'. Assumption in D increases the likelihood of solar PPs cost to drop below regular PPs cost.