Solar cells use the energy in sunlight to produce electricity. Thus, solar cell is device which converts solar energy (or sun's energy) directly into electricity. Since solar energy is also called sunlight energy, so we can say that a solar cell converts sunlight energy into electri…

Solar Cooker:-    " The solar Cooker is a device which is used to cook food by utilising the energy radiated by the sun". A solar Cooker consists of an insulated metal box or wooden box which is painted all black from inside. There is a thick glass sheet cover over the box and a…

Moving air is called wind. Wind has a energy. The energy possessed by wind is due it's high speed (or motion). So, the wind kinetic energy. It this kinetic energy of wind which is utilised for doing work. Solar energy (or sun's energy) is responsible for the blowing of wind. Wind …

Flowing water possesses kinetic energy. The energy of flowing water has been traditionally used for rotating the water wheels and drive- water mills to grind wheat to make flour. The traditional use of energy of flowing water has been modified by improvements in technology and use to ge…

" The Sun and the surrounding sky appear red at sunrise and at sunset because at that time most of the blue colour present in sunlight has been scattered out and away from our line of sight, leaving behind mainly red colour in the direct sunlight beam that reaches our eyes".  …