In a hydroelectric power plant, moving water is used for driving the wheels of a turbine to generate electricity. If the change in kinetic energy of turbine is 1200 J in 2 minutes then the power generated is

100 W

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10 W

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200 W

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20 W

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Solution

The correct option is B
10 W

Change in kinetic energy =1200 J
Time taken = 2 min = 120 s
The potential energy of the waterfall is utilised to move the turbine blades and the change in kinetic energy would be equal to the work done which is equal to 1200 J. Power is defined as the work done per unit time
Power = $\frac{w o r k d o n e}{t i m e} = \frac{1200}{120} = 10 W .$

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Similar questions

Which one of the following statements about power stations is not true ?

(a) hydroelectric power stations use water to drive turbines

(b) in a power station, turbines drive generators

(d) in hydroelectric power stations and thermal power stations, alternators produce electricity

Statement 1: The turbine is used for generating electricity in thermal power plant, a hydropower plant and geothermal power plant.

Statement 2: Because turbine converts one form of energy to mechanical energy which further produces electric energy.

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