Class 10 Physics Sources of Energy Solar Energy

Solar Energy

 

  • Sun's heat which falls on the earth can be harnessed for various heating and lighting purposes.
  • Most of the sun's heat is absorbed is the atmosphere.
  • Only a very small portion reaches the earth and it is this energy that can be harnessed for energy purposes.
  • A black surface absorbs more heat than a white surface.
  • This property is used in Solar cookers, Solar water heaters and Solar cells.

 

Working Solar cooker

 

 

  • It has a reflective mirror of highly polished glass so that the sun's light is focussed into the system.
  • Then this is converted to heat energy. The black surface absorbs more heat.
  • The heat is trapped in the sealed glass/plastic bag such that the heat does not escape.
  • The food gets cooked because of this heat.

 

Advantages of Solar energy

Disadvantages of Solar energy

·         Renewable source of energy

·         Environment friendly

·         Easy to install and use.

 

·         It cannot be used on cloudy and rainy days.

 

 

 

Working of Solar cell/Solar panel

 

 

  • It converts solar energy into electricity.
  • Since sun light will not be available during cloudy days, this cell can be used when there is sunlight to store the energy as electricity.
  • Multiple solar cells put together form a solar panel and enhances quantity of electricity
  • Works on the principle of 'Photovoltaic effect'.
  • Solar cells are used in calculators, torches, traffic signals, TV and radio relay stations etc

 

Advantages of Solar cells

Disadvantages of Solar cells

·         Renewable source of energy

·         Environment friendly

·         Easy to maintain.

·         Very useful in remote locations where there is a power crisis

 

·         Initial setup cost is high.

 

 

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