FORM 2-PHYSICS-TOPIC 9-SUSTAINABLE ENERGY SOURCES
SUSTAINABLE ENERGY SOURCES
Sustainable energy, specifically renewable energy or green energy, is an energy source which can be replenished, that is essentially inexhaustible. Sustainable sources of energy include solar, wind, water, biomass and geothermal. Non renewable energy sources include coal, oil and natural gas.
Wind as a Source of Energy
Explain wind as a source of energy
Wind energy refers to the energy obtained from wind.It can be converted into electricity.Babylonians and Chinese used wind energy as a source of energy to pump water for irrigation 4000 years ago.
Wind energy can be converted into electricity by building a tall tower with a large propeller on top called windmill.
When wind blows, it rotates the propeller, which causes the attached generators to produce electricity.
Note: for more electricity to be produced, more properties are needed.
A Model of a Wind Mill
Construct a model of a Wind Mill
Diagram of a wind mill
A Wind Mill in Daily Life
Apply Wind Mill in daily life
Application of wind energy
For centuries, people have been using the power of the wind to move ships, boats and pump water.
Today, enormous wind energy is used to turn generators that facilitate the production of power. As windmills are efficient, very large turbines are required to providing the much-needed power.
Disadvantages of wind energy
- Wind energy is not reliable
- Winds are variables
- The wind turbines are noisy and can spoil the landscape.
- Large windy sites are required
