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प्रश्न
Name the energy transfers which occur when : a torch is on
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उत्तर
A torch converts electrical energy of the battery into light and heat energy.
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संबंधित प्रश्न
State the condition under which the mechanical energy is conserved.
A metal ball of mass 2 kg is allowed to fall freely from rest from a height of 5 m above the ground. Taking g = 10 m s−2, calculate:
- the potential energy possessed by the ball when it is initially at rest.
- the kinetic energy of the ball just before it hits the ground?
What type of energy is possessed : by the piece of stone which is thrown away on releasing the stretched rubber strings of catapult?
What are the various forms of energy?
Fill in the blank with suitable word:
The electricity meter installed in our homes measure electrical energy in the units of ___________.
Fill in the blanks with suitable words:
When a ball is thrown upwards, ___________ energy is transformed into ___________ energy.
Describe the energy changes which take place in a radio.
Write the energy transformations which take place in an electric bulb (or electric lamp).
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?
An object is falling freely from a height x. After it has fallen a height `pi/2` , it will possess :
