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प्रश्न
State two advantages and disadvantages of using wind energy for producing electricity.
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उत्तर
Advantages:
(i) Wind is free and will run not (renewable sources).
(ii) Wind energy does not create greenhouse gases.
Disadvantages:
(i) The wind farms can be established only at places near the coastal areas where the wind blows around the year steadily with a speed not less than 15 Km h-1.
(ii) The establishment of the wind farm is expensive.
संबंधित प्रश्न
Give one relevant example for the following transformation of energy :
Electrical energy to light energy.
A ball is made to fall freely from a height. State the kind/ kinds of energy possessed by the ball when it is at the highest point .
A ball is made to fall freely from a height. State the kind/ kinds of energy possessed by the ball when it is at the ground.
State two disadvantages of using wind energy for generating electricity.
State the energy transformation on the following:
Electricity is obtained from hydro energy.
A metal ball of mass 2kg is allowed to fall freely from rest from a height of 5m above the ground.
What the kinetic energy of the ball just before it hits the ground ?
State the energy changes which take place when:
A stone projected vertically upwards, returns back to the thrower.
Draw a diagram to show the energy changes in an oscillating simple pendulum. Indicate in your diagram how the total mechanical energy in it remains constant during the oscillation.
A ball of mass 200 g falls from a height of 5 m. What will be its kinetic energy when it just reaches the ground? (g = 9.8 m s−2)
