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At a hydro power plant:
A hydro power plant is a complex of installations and equipment that is used to convert the energy of a stream of water into electrical energy.
A solar water heater cannot be used to get hot water on:
The part of box-type solar cooker which is responsible for producing greenhouse effect is:
Solar cells are made of:
The value of solar constant is
The radiations present in sunlight which make a solar cooker work are
In order to make an efficient solar cooker, the cover box should be made of :
The minimum speed of wind necessary for the satisfactory working of a wind generator to produce electricity is about :
If the solar constant is 1.4 kW/m2, then the solar energy received by 1 m2 area in one hour is :
A solar cooker may not cook food if :