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Energy supplied to the station = 9 x 10^8 J/s
Efficiency of power station = 34%
That is, only 34% of the energy input is converted to the output and rest is lost in the process.
The amount of useful energy generated = 34% of energy input
= 34% of 9 x 10^8 J/s
= 34/100 x 9 x 10^8 J/s
= 3.06 x 10^8 J/s.
Thus, the power station produces 3.06 x 10^8 J of useful energy per second.
Hope this helps.
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