Question

What is power? How do you differentiate kilowatt from kilowatt hour? The jog falls in Karnataka state are nearly 20m high. 2000 tonnes of water falls from it in a minute.

Answer 1

1 )Power is the rate of doing work.

2) Kilowatt is the unit of power and kilowatt hour is the unit of energy.

3) Given 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