The following text is from an article about renewable energy.
Wind turbines convert the kinetic energy of moving air into electricity. When wind spins the turbine blades, the rotation drives a generator. Modern turbines can begin producing power in winds as light as 8 miles per hour. Larger offshore turbines, benefiting from stronger and more consistent ocean winds, can generate enough electricity to power thousands of homes.
What is the main purpose of the text?
To explain how wind turbines generate electricity
To argue against fossil fuel energy sources
To compare wind energy to solar energy
To describe the environmental damage caused by turbines
Correct Answer: A
Choice A is the best answer. The text explains the process of wind energy conversion: wind spins blades, rotation drives generators, and turbines produce electricity.
- Evidence: The text states turbines "convert kinetic energy... into electricity." It details the steps: "wind spins the turbine blades," "rotation drives a generator."
- Reasoning: The passage focuses on the mechanism of how the technology works.
- Conclusion: The purpose is to explain this generation process.
💡 Strategy: Identify the subject (wind turbines) and the action described (converting wind to electricity).
Choice B is incorrect because fossil fuels aren't mentioned. Choice C is incorrect because solar energy isn't compared. Choice D is incorrect because environmental damage isn't discussed.