Physics
State the energy changes that occur in the following:
(i) The unwinding of a watch spring.
(ii) Burning coal while operating a steam engine
(iii) Lighting of a torch bulb.
(iv) An electric generator (or dynamo).
Work, Energy & Power
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Answer
(i) During the unwinding of a watch spring, the potential energy changes into kinetic energy.
(ii) In a steam engine chemical energy of coal first changes into heat energy which is transferred to steam. Then the heat energy of steam changes into mechanical energy which causes the train to move.
(iii) When torch bulb is lighted, chemical energy of batteries change into light and heat energy.
(iv) In an electric generator (dynamo) mechanical energy changes into electrical energy.
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Related Questions
Name the type of energy (kinetic or potential) possessed by the following:
(i) A moving cricket ball.
(ii) A stone at rest on the top of a building.
(iii) A compressed spring.
(iv) A moving bus.
(v) A bullet fired from a gun.
(vi) Water flowing in a river.
(vii) A stretched rubber band.
Give one example to show the conversion of potential energy to kinetic energy when put in use.
Energy can exist in several forms and may change from one form to another. Give two examples to show the conversion of energy from one form to another.
Give one relevant example for each of the following transformations of energy:
(i) Electrical energy to heat energy
(ii) Electrical energy to mechanical energy
(iii) Electrical energy to light energy
(iv) Chemical energy to heat energy
(v) Chemical energy to light energy