Question

what is a solR energy device???

Answer 1

We have studied that sunlight consists of infra-red rays. The heat of infra-red rays can be utilized to do some useful works by preparing suitable devices. Those devices which directly utilize solar energy to do some useful works are called solar energy devices. Solar cookers, solar cells, solar water heaters, solar furnaces, solar thermal plants etc. are examples of solar energy devices.

Limitations or Drawbacks of Solar Heating Devices

The main drawback of solar heating devices is that there efficiency is very low as compared to those devices which run on electricity. The reason for it is that all the solar heating devices depend on sun light for their working. But, the sunlight reaches the earth in much diffused form. Also a large amount of heat absorbed from sunlight by solar heating devices is lost by the process of conduction, convection and radiation.

The second drawback of solar heating devices is that they cannot be used to cook food during night and rainy days when the sky is covered with clouds.

The third drawback of solar heating devices is that the direction of their reflectors has to be changed after short intervals of time of keep them facing the sun

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Answer 2

Answer:

Those devices which directly utilize solar energy to do some useful works are called solar energy devices. Solar cookers, solar cells, solar water heaters, solar furnaces, solar thermal plants etc. are examples of solar energy devices.