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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
A force of 50 N acts on a body and moves it a distance of 4 m on horizontal surface. Calculate the work done if the direction of force is at an angle of 60° to the horizontal surface.
Does the earth move around the sun with a uniform velocity?
What is the work done when the object acted upon by a force remains at rest?
Give two examples of work done.
A machine raises a load of 750 N through a height of 16 m in 5s. calculate:
(i) work done by machine,
(ii) power at which the machine works.
State the energy changes which take place when Water stored in the dam is used to turn turbine in dynamo.
Give an example
Electrical energy changes to heat energy.
A man climbs a slope and another walks same distance on level road. Which of the two expends more energy and why?
What is power? How do you differentiate kilowatt from kilowatt-hour? The Jog Falls in Karnataka state are nearly 20 m high. 2000 tonnes of waterfalls from it in a minute. Calculate the equivalent power if all this energy can be utilized? (g = 10 m s–2)
