Question

From a water fall, water is falling at the rate of 100 kg/s on the blades of turbine. If the height of the fall is 100m then the power delivered to the turbine is approximately equal to

• A. 100Kw
• B. 10 kW
• C. 1Kw
• D. 1000 Kw

Answer 1

Answer: (A)

100Kw

Answer 2

$\text{Power} = \frac{\text{Work done}}{t} = \frac{mgh}{t} = 100 \times 10 \times 100$

$= 10^{5}watt = 100kW$ $\left\lbrack \text{As }\frac{m}{t} = \text{100}\frac{kg}{\sec\text{given}}\lbrack\rbrack \right\rbrack$