What is power? How do you differentiate | Class 9 Science Chapter Work and Energy, Work and Energy NCERT Solutions

Question:

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)

Answer:

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

Mass = 2000 tones = (2000 x 10^3 kg = 2 x 10^6 kg)
Height = 20 m
Power, P = (mgh) / t
= (2 x 10^6 x 10 x 20) / 60 => (2/3) x 10^7 W


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Welcome to the NCERT Solutions for Class 9 Science - Chapter . This page offers a step-by-step solution to the specific question from Excercise 0 , Question 25: What is power? How do you differentiate kilowatt from kilowatt hour? The Jog Falls in Karnataka stat....