9
lesson pretestMultiple Choice

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Question 9 • Physics I

What is the sequence of energy transformations associated with a hydroelectric dam?

Answer
A
chemical energy into kinetic energy into mechanical energy into electrical energy
B
gravitational potential energy into kinetic energy into mechanical energy into electrical energy
C
electrical energy into mechanical energy into kinetic energy into gravitational potential energy
D
chemical energy into thermal energy into kinetic energy into electrical energy

Explanation

Water stored high behind the dam has gravitational potential energy. As it flows downward, that energy becomes kinetic energy; the moving water turns a turbine, producing mechanical energy, and a generator converts that into electrical energy. This matches choice B.

AI-written and checked against the verified answer.

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