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प्रश्न
Give an account of the use of solar energy.
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उत्तर
Solar energy is the energy that we receive from the sun. It is readily available in nature and in unlimited quantities.
While there are several ways to obtain solar energy, one way is by the use of solar cells or photovoltaic panels. These panels are made from very thin semiconducting materials which, when exposed to sunlight, use the heat and light of the sun to shake the electrons loose and create an electric current.
Solar cells are used for lighting street lamps, electronic calculators, watches, smartphones, cameras, traffic signals, water pumps, and home lighting. Solar energy is being used to heat ovens, cook food, and heat water.
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संबंधित प्रश्न
Classify the following into renewable and non-renewable sources of energy:
Coal, Wind, Tides, Petroleum,Wood, Natural gas
A non-renewable source of energy is:
(a) wood
(b) alcohol
(c) hydrogen gas
(d) natural gas
The calorific values of three fuels A, B and C are 33 kJ/g, 48 kJ/g and 150 kJ/g, respectively. A is solid, B is liquid and C is a gas at room temperature. One combustion, both A and B produce carbon dioxide while C explodes forming steam. B and C leave no residue after combustion while A leaves behind some solid residue. Which one of the three fuels is the most ideal? Give two reasons to support your answer.
Name any four fractions obtained from petroleum which are used as fuels.
What is meant by conventional sources of energy? Write the names of two conventional sources of energy.
Which fossil fuels were formed by the buried remains of small plants and animals?
Compare the sun and the fossil fuels as the sources of energy.
Fill in the following blank with suitable word:
Biomass is another form in which ........... energy manifests itself.
Fill in the following blank with suitable word:
Tidal waves build up and recede ........... a day.
What is biomass? Give three examples of biomass.
Name the biomass which is still widely used as a source of heat energy in many household of our country.
An energy efficient devices for producing light is:
(a) DLF
(b) CFL
(c) FCL
(d) LPG
Fill in the blank
Solar cells use the power supplied by the ______.
Write a short note on nuclear power.
Explain why is it no wise to regard wood as a renewable sources of energy.
Choose the odd one:
Write about Renewable resources.
Make a list of conventional and non-conventional sources of energy. Give a brief description of harnessing one nonconventional source of energy.
Air is a natural resource and cannot be exhausted by human activities. It is known as inexhaustible natural resource. Which of the following is another inexhaustible natural resource?
Write True/False against the following statement.
Oxygen in air is an exhaustible natural resource.
