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प्रश्न
State the energy changes which take place when:
A bulb glows, when torchlight is switched on.
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उत्तर
The chemical energy of cell changes to electric energy. The electric energy first changes to heat and finally to light energy.
संबंधित प्रश्न
State the energy change in the following device while in use:
A loudspeaker
Define calorific value of a fuel.
Give one example of a body that has potential energy, in due to its state.
State two advantages and disadvantages of using nuclear energy for producing electricity.
Give one example when:
Potential energy changes to electric energy.
What is the form of that graph between
(i) K.E. and velocity for a constant mass?
(ii) K.E. and mass for a constant velocity?
What is nuclear energy? Explain the principle of producing electricity using nuclear energy is a nuclear reactor.
A body is thrown vertically upwards. Its velocity keeps on decreasing. What happens to its kinetic energy as its velocity becomes zero?
Geothermal energy is:
Energy from various sources is considered to have been derived from the sun. Do you agree? Justify your answer.
