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A family uses 8 kW of power, (a) Direct solar energy is incident on the horizontal surface at an average rate of 200 W per square meter. If 20% of this energy can be converted to useful electrical energy, how large an area is needed to supply 8 kW? (b) Compare this area to that of the roof of a typical house.

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200 square metre area is needed May be a house of 20 × 10 m
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Ayush

20percent of 200 W is 40 W i.e. only 40w per square metre power available . Total requirement is 8000W . Power per m^2 is 40 W . Area require 8000/40 i.e. 200 m^2
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