__Question 6.23__:

__Solution__:**(a)**Power used by the family,

*P*= 8 kW = 8 × 10

^{3}W

Efficiency of conversion from solar to electricity energy = 20 %

Area required to generate the desired electricity =

*A*

As per the information given in the question, we have:

8 X 10

^{3}= 20% X (A X 200)

= (20 /100) X A X 200

∴ A = 8 X 10

^{3}/ 40 = 200 m

^{2}

**(b)**The area of a solar plate required to generate 8 kW of electricity is almost equivalent to the area of the roof of a building having dimensions 14 m × 14 m. (≈ √

*200)*

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