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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
Does the transfer of energy take place when you push a huge rock with all your might and fail to move it? Where is the energy you spend going?
A stone of mass 500 g is thrown vertically upwards with a velocity of 15 m/s. Calculate:
- the potential energy at the greatest height,
- the kinetic energy on reaching the ground, and
- the total energy at its half-way point.
What kind of energy is possessed by the following?
A compressed spring ____________.
Two bodies having equal masses are moving with uniform speeds of v and 2v respectively. Find the ratio of their kinetic energies.
What is the difference between potential energy and kinetic energy?
Name the device or machine which convert :
Electrical energy into heat energy.
What kind of energy transformations take place at a coal-based thermal power station?
How much electrical energy in joules does a 100 watt lamp consume : in 1 second?
Explain the transformation of energy in the following cases :
(i) A ball thrown upwards.
(ii) A stone dropped from the roof of a building.
A ball falls to the ground as shown below :
What is the potential energy of ball at B?
