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Could anyone help me with this sum - To generate electricity, 180000 kg water is dropped from a height of 50 m (let g = 10 m/s^2). If half the gravitational potential energy is converted to electric energy, how many 100 W bulbs can be lit ?

Formula - Ep = mgh

I calculated the potential energy to be 90000000 J. Half of it is electric energy = 45000000 J. I am at a loss from here.

Formula - Ep = mgh

I calculated the potential energy to be 90000000 J. Half of it is electric energy = 45000000 J. I am at a loss from here.

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