Windmills work by using large blades to catch the wind. When the wind blows, it turns the blades around a rotor, which spins a generator to produce electricity or performs mechanical work like pumping water or grinding grain. Essentially, windmills convert the kinetic energy of the wind into mechanical power or electricity.
MCQs
1. What is the main purpose of modern windmills?
A) To grind grain into flour
B) To pump water
C) To generate electricity
D) To decorate gardens
Answer: C) To generate electricity
Explanation: Modern windmills, often called wind turbines, are primarily used to generate electricity as part of renewable energy sources.
2. What part of the windmill captures the wind?
A) The base
B) The tower
C) The blades
D) The generator
Answer: C) The blades
Explanation: The blades of a windmill capture the wind’s energy, allowing the windmill to do work, such as generating electricity or pumping water.
3. How does the wind’s energy get converted into electricity in a wind turbine?
A) The wind heats the blades
B) The blades spin a shaft connected to a generator
C) The wind directly charges batteries
D) The blades reflect sunlight to a generator
Answer: B) The blades spin a shaft connected to a generator
Explanation: The blades are connected to a shaft that turns with the blades. This shaft is connected to a generator, and as it turns, it converts the mechanical energy into electrical energy.
4. What historical use did windmills have before electricity generation became common?
A) Sending messages
B) Grinding grain
C) Driving cars
D) Heating homes
Answer: B) Grinding grain
Explanation: Historically, windmills were commonly used for grinding grain into flour, as well as for pumping water and other agricultural purposes.
Fill in The Blanks
Choose from These Words: wind, renewable.
1. Windmills work by harnessing the power of the ___________ to generate electricity.
Answer: wind
2. Windmills are a clean and ____________ source of energy.
Answer: renewable
True / False
1. Windmills create electricity by using the energy from the sun (True / False)
False: Windmills create electricity by using the energy from the wind, not the sun.
2. Windmills work by turning the blades with the help of water (True / False)
False: Windmills work by turning the blades with the help of wind, not water.
3. Windmills can only generate electricity during the day (True / False)
False: Windmills can generate electricity day and night as long as there is enough wind to turn the blades.
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