First slide

Power

Question

Water falls from a height of 60 m at the rate of 15 kg/s to operate a turbine. It losses 10% of energy due to frictional forces . How much power is generated by the turbine?
(g = 10 $m / s^{2}$ )

Moderate

A

8.1 kW
B

10.2 kW
C

12.3 kW
D

7.0 kW

Solution

Power generated by the turbine is,
$P_{generated} = P_{input} \times \frac{90}{100}$
= $\frac{Mgh}{t} \times \frac{90}{100}$
Putting the given values
$\frac{M}{t} = 15 k g / s, g = 10 m / s^{2}, h = 60 m$
$P_{generated} = (15 \times 10 \times 60) \times \frac{90}{100}$
= 8.1 kW

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