# Water falling fro

Height from which the water falls, h = 50 m

Mass of water falling per hour = 1.8 × 105 kg

Mass of water falling per sec,

m= 50 kg

Gravitational potential energy released per sec = mgh

= 50 × 9.8 × 50

= 24500 J

Electrical energy generated per sec = (Gravitational potential energy)/2

= 24500/2

= 12250 J

Power generated = 12250 J/s or W

Number of 100 W lamps that can be lit from this power = 12250/100 = 122.5 ≈ 122 lamps

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