Question

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:

• A. 100 W
• B. 10 W
• C. 200 W
• D. 20 W

Answer 1

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.