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प्रश्न
Give an example
Light energy changes to electrical energy.
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उत्तर
Solar cell
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संबंधित प्रश्न
Write an expression for the work done when a force is acting on an object in the direction of its displacement.
Differentiate between energy and power.
A water pump raises 50 litres of water through a height of 25 m in 5 s. Calculate the power of the pump required.
(Take g = 10 N kg-1 and density of water = 1000 kg m-3)
Is work done a scalar or a vector physical quantity?
Can two agents, doing the same work, have different power?
In what way does an ‘Ideal machine’ differ from a ‘Practical machine’?
What should be the characteristic of a source of energy?
Look at the activity below. Reason out whether or not work is done in the light of your understanding of the term ‘work’.
A wind-mill is lifting water from a well.
