Q25Long 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 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 m gh 2 ×106 ×1 0 × 20 Power = = W t 60 4 2 = × 10 7 W = ×10 7 W 6 3 work done or energy m gh h