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प्रश्न
State the changes in form of energy while producing hydro electricity.
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उत्तर
The water in motion in a river or sea has the kinetic energy. The energy possessed by the flowing water is called the hydro energy. The most important use of hydro energy is to produce electricity from it.
Figure shows the principle of a hydroelectric power plant. The flowing water of the river is collected in a dam at a high altitude. The water stored in the dam has potential energy. When water from dam falls on the water turbine, the potential energy of the water stored in dam changes into its kinetic energy and this kinetic energy of water is transferred to the blades of turbine as the kinetic energy which rotates the turbine. As the turbine rotates, it rotates the armature of the generator (or dynamo) to produce electricity.
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संबंधित प्रश्न
Fill in the blank
The energy possessed by a body due to its position is called ________ energy.
Give one example of a body that has potential energy, in due to its state.
Name the type of energy (kinetic or potential) possessed by the following:
A stone at rest on the top of a building.
State two disadvantages of using wind energy for generating electricity.
What kind of energy is possessed in a situation when?
A stone, in a stretched catapult.
State the energy changes which take place when:
A battery lighting up a bulb.
Give one example when:
Kinetic energy to potential energy.
Give one example when:
Electrical energy to heat energy.
A ball of mass 50 g falls from a height of 2m and rebounds from the ground to 1.6 m. Find:
(i) The potential energy possessed by the ball when initially at rest.
(ii) The kinetic energy of the ball before it hits the ground.
(iii) The final potential energy of the ball.
(iv) The loss in kinetic energy of the ball on collision. (Take: g = 10N kg−1)
