question_answer

  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 water falls from it in a minute. Calculate the equivalent power if all this energy can be utilised?

Answer:

   (a) Power is defined as the rate of doing work or the rate of transfer of energy. The unit of power is watt or kilowatt.                                (b) Kilowatt is the unit of power while kilowatt hour is bigger unit of energy. 1 kilowatt hour = 3.6 x 106 J               (c) Mass of water = 2000 tonnes                   1 tonne = 1000kg Mass of water = 2000 x 1000 = 2 x 106 kg Power Yes, this power can be utilised.