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प्रश्न
State the energy changes in the following case while in use:
an electric bulb
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उत्तर
Electrical energy into light energy
संबंधित प्रश्न
Calculate the change in the Kinetic energy of a moving body if its velocity is reduced to 1/3rd of the initial velocity.
State the energy change in the following device while in use:
A loudspeaker
State two advantages of using wind energy for generating electricity.
Name the energy changes for each of the following cases:
dynamo
The following are some of the energy transformations.
A. Electrical to light
B. Work to heat
C. Chemical to light
D. Electrical to sound
E. Mechanical to electrical
Identify the energy transformation that takes place in the following by inserting the corresponding letter in the shape provided.
(i) A candle flame
(ii) A torch is lighted
(iii) A microphone is used in a meeting
(iv) A cycle dynamo
(v) A piece of metal is being filed
State the energy changes which take place when:
Photographic film is exposed to sunlight.
State the energy changes which take place when:
Food is digested by animals.
Give one example when:
Chemical energy changes to light 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)
