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

Here, the kinetic energy of the water is utilised in moving the turbine blades.
Thus, the change in kinetic energy of water is equal to the work done on turbine blades which is equal to 1200 J.

Power is defined as the work done per unit time i.e. P = $\frac{1200}{120}$ = 10 W.

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Similar questions

If the change in kinetic energy of a car is 1200 J in 2 minutes then the power generated by its engine is:

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, hydro power 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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