First slide

Power

Question

Water falls from a height of 60 m at the rate of 15 kg/s to operate a turbine. The losses due to frictional forces are 10% of energy. How much power is generated by the turbine? (g = 10 m/s²)

Easy

A

12.3 kw
B

7.0 kw
C

8.1 kw
D

10.2 kw

Solution

Generated power $= (\frac{mgh}{t}) (0 .9) = (15 \times 60 \times 10) (0 .9)$
= 8.1 x 10³ w = 8.1 kw

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