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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 utilized? (g = 10 m s–2)

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Power is the rate of doing work. Kilowatt is the unit of power and kilowatt hour is the unit of energy. 

h = 20 m, and mass = 2000 × 103 kg = 2 × 106 kg 

Power = m g h / t = 2 x 106 x 10 x 20 /60 w

 = 4 / 6 x107w

= 2 / 3 x 107w

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