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प्रश्न
State two disadvantages of using wind energy for generating electricity.
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उत्तर
Disadvantages of using wind energy:
1. The establishment of a wind farm is expensive.
A large area of land is needed for the establishment of a wind farm.
संबंधित प्रश्न
Define calorific value of a fuel.
Write true or false of the following statement.
There is always some loss of energy in conversion from one form of energy to another form, so the total energy is not conserved.
Give one relevant example for the following transformation of energy :
Electrical energy to light energy.
Name the form of energy which a body may possess even when it is not in motion. Give an example to support your answer.
Show that the quantity 2K/v2 has the unit of mass, where K is the kinetic energy of the body.
Write the type of energy possessed in the following case:
A falling apple
State the energy changes which take place when:
Water freezes in the freezing chamber of a fridge.
Give one example when:
Electric energy changes to potential energy.
A girl of mass 35 kg climbs up from the first floor of a building at a height 4 m above the ground to the third floor at a height 12 m above the ground. What will be the increase in her gravitational potential energy? [g = 10 ms-2]
In a hydroelectric power station, 1000 kg of water is allowed to drop through a height of 100 m in 1 sec. If the conversion of potential energy to electric energy is 60%. Calculate the power output. [Take: g = 10m/sec2]
