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प्रश्न
What do you understand by the term 'transformation of energy"? Explain with an example.
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उत्तर
The change of one form of energy into another form is known as transformation of energy. This process helps us to convert one form of energy into a more desirable form of energy.
Example - Energy transformation at a hydroelectric power plant
At a hydroelectric power station, a dam is built on a river. Water collected in the reservoir has lots of potential energy. The potential energy of the water gets converted into kinetic energy as it begins to fall down. The kinetic energy of falling water is used to drive huge turbines, which are connected to the electric generator.
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संबंधित प्रश्न
Show that the sum of kinetic energy and potential energy (i.e., total mechanical energy) is always conserved in the case of a freely falling body under gravity (with air resistance neglected) from a height h by finding it when
- The body is at the top.
- the body has fallen a distance x.
- the body has reached the ground.
Is energy a vector quantity?
State whether the object possess kinetic energy, potential energy, or both :
A flying aeroplane _______________.
A boy weighing 40 kg makes a high jump of 1.5 m.
What is his kinetic energy at the highest point?
Name the device or machine which convert :
Electrical energy into light energy.
Name the device or machine which convert :
Electrical energy into sound energy.
What kind of energy transformation take place at a hydroelectric power station?
The hanging bob of a simple pendulum is displaced to one extreme position B and then released. It swings towards centre position A and then to the other extreme position C. In which position does the bob have :
(i) maximum potential energy?
(ii) maximum kinetic energy?
Name the energy transfers which occur when :
someone speaks into a microphone
The device which converts mechanical energy into energy which runs our microwave oven is :
