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(a) What is the meaning of the symbol kW...

(a) What is the meaning of the symbol kWh ? What quantity does it represent ?
(b) How much electric energy in kWh is comsumed by an electrical appliance of 1000 watts when it is switched on for 60 minutes ?

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The correct Answer is:
(b) 1 kWh
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LAKHMIR SINGH & MANJIT KAUR-WORK AND ENERGY-Exercise
  1. The hanging bob of a simple pendulum is displaced to one extreme posit...

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

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

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

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

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

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

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

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

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

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  11. COMMERCIAL UNIT OF ENERGY

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

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

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  14. A microphone converts

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

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  16. A ball falls to the ground as shown below : (a) What is the kinet...

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  17. In an experiment to measure his power, a student records the time take...

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  18. In loading a truck, a man lifts boxes of 100 N each through a height o...

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  19. Name the energy transfers which occur when : (a) an electric bell ri...

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  20. A force of 7 N acts on an object. The displacement is, say 8 m, in the...

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