Answer:
(a)
Solar concentrators are the devices which concentrate solar heat in a small
area to raise its temperature to high degrees. This heat can be used to cook
food, heat water and generate electricity. (1)
(b) Solar cell panels are the assembly of solar cells fabricated together
and produce electricity when sunlight falls on them. (1)
They are an improvement over simple devices because they
efficiently use the abundantly available solar energy to do work. They have
also raised the possibility to minimise the use of fossil fuels and other
conventional sources to obtain energy. (2)
Solar cell panels are costly because the connections of solar
cells in a panel are made using silver wire which is an expensive metal
(1)
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