Energy: Sources Flashcards
(25 cards)
What is the primary source of light and heat energy?
The Sun
The Sun provides energy used for photosynthesis and various applications through solar energy.
What is energy from the Sun called?
Solar energy
Solar energy is harnessed for various purposes including heating water and generating electricity.
What are common uses of solar energy?
- Heating water
- Providing electricity
- Photosynthesis
Solar panels are commonly used to trap solar energy.
TRUE OR FALSE:
Wind is a kinetic energy source that will not run out?
True. Wind (like water) is source of kinetic energy and will not run out.
Wind energy is harnessed through windmills and wind turbines.
What can wind energy be used for?
- Running windmills to grind grain
- Extracting oil from seeds
- Generating electricity with wind turbines
Windmills and wind turbines are key technologies for harnessing wind energy.
Why do we need to conserve energy?
To ensure sustainability and reduce resource depletion
Energy conservation is crucial for environmental protection and future energy availability.
How can we classify sources of energy?
By their renewability and type
Sources can be renewable (like solar and wind) or non-renewable (like fossil fuels).
What are the sources of energy derived from running water?
Rivers, streams, and waterfalls
Running water has potential and kinetic energy and will not run out.
What are the uses of running water in energy generation?
Hydroelectric power stations to generate electricity
Involves the use of stored water and turbines.
What type of energy do fuels in a hydroelectric power station possess?
Chemical potential energy
Examples include wood, coal, oil, and natural gas.
What is a key characteristic of fossil fuels?
Limited supply; can run out
Fossil fuels are burnt in power stations to generate electricity.
What are some common uses of fossil fuels?
To generate electricity, to cook food, to heat water, to run vehicles
Fossil fuels are a major energy source in various applications.
Why is the Sun considered the main source of energy?
It is the primary source of energy for all living things
Plants use light energy from the Sun to make food.
How does energy from the Sun relate to fossil fuels?
Energy stored in fossil fuels can be traced back to the Sun
Fossil fuels formed from the remains of tiny plants and animals.
What role does the Sun play in weather patterns?
Causes rain by evaporating water that forms clouds
The Sun’s heat helps create winds across Earth.
Fill in the blank: The energy from the Sun is passed from plants to _______.
animals
This transfer of energy is crucial for the food chain.
How can we classify sources of energy?
Energy sources can be classified into two groups: renewable and non-renewable.
What are examples of non-renewable energy sources?
Coal, petroleum, and natural gas are examples of non-renewable energy sources.
They are used to generate electricity, heat homes, move cars, and manufacture products.
Why are non-renewable energy resources considered limited?
Non-renewable energy resources are limited in supply because they cannot be produced quickly. For example, petroleum was formed millions of years ago.
What are examples of renewable energy sources?
Renewable energy sources include biomass, geothermal energy, hydropower, solar energy, and wind energy.
They are replenished in a short time.
What is a primary energy source?
Energy sources found in nature, such as fossil fuels, are called primary energy sources.
What is a secondary energy source?
Energy sources produced by people using primary energy are called secondary energy sources.
Electricity is an important secondary energy source.
Why do we need to conserve energy?
We need to conserve energy to ensure there is enough energy for Earth’s growing population and because fossil fuels will soon run out.
What does energy conservation involve?
Energy conservation involves using the minimum amount of energy needed and not wasting any energy.
