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Write the energy transformations which t...

Write the energy transformations which take place in an electric bulb (or electric lamp).

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LAKHMIR SINGH & MANJIT KAUR-WORK AND ENERGY-Exercise
  1. Five electric fans of 120 watts each are used for 4 hours. Calculate t...

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  2. Describe the energy changes which take place in an radio.

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  3. Write the energy transformations which take place in an electric bulb ...

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  4. Name five appliances or machines which use an electric motor.

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  5. A bulb lights up when connected to a battery. State the energy change ...

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  6. The hanging bob of a simple pendulum is displaced to one extreme posit...

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  7. A car of weight 20000 N climbs up a hill at a steady speed of 8 m/s, g...

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  8. (a) What is the meaning of the symbol kWh ? What quantity does it repr...

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  9. (a) Derive the relation between commercial unit of energy (kWh) and SI...

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  10. (a) Define power. Give the SI unit of power. A boy weighing 40 kg ca...

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  11. When a body falls freely towards the earth, then its total energy

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  12. Which one of the following is not the unit of energy?

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  13. Which of the following energy change involves frictional force?

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  14. An electric motor raises a load of 0.2 kg, at a constant speed, throug...

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  15. An object is falling freely from a height x. After it has fallen a hei...

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  16. COMMERCIAL UNIT OF ENERGY

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  17. How much energy does a 100W electric bulb transfer in 1 minute?

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  18. The device which converts mechanical energy into energy which runs our...

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  19. A microphone converts

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  20. The following data was obtained for a body of mass 1 kg dropped from a...

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