Discussion
Assertion (A) : Solar photovoltaic cells are expensive.
Reason (R) : Solar photovoltaic cells are fabricated from crystalline silicon and operate only at 10-12% efficiency. Identify the correct answer :
Codes :
Answer: A
Both (A) and (R) are true and (R) is the correct explanation of (A). Solar photovoltaic cells are expensive because they are made from high-purity crystalline silicon, whose purification and wafer production are costly, and because they convert only about 10-12 per cent of the sunlight to electricity in the cells cited here. A low efficiency means that a large area is needed per unit of power, which raises the cost per kilowatt. The reason is therefore a direct cause of the assertion, which excludes the code that treats it as unrelated.
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