Pre-K
Biofuels and Sun as
energy source
9a Ariunzaya, Maralgoo
WHAT WILL WE LEARN IN THIS TOPIC?
01 What is biofuel?
02 Examples
How does sun become
energy source?
04 Examples
03
01
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What is
Biofuel?
Biofuel
Biofuels are liquid fuels produced
from renewable biological sources,
including plants and algae. In
biofuels, chemical energy can be
stored and it can replace petrol.
02
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Examples
Examples
Solid biofuels
Liquid biofuels
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•
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Fuelwood
Animal waste
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Biodiesel
bio gasoline
•
Biogases
Anaerobic
fermentation
Advantages
1. Renewability
2. Maintenance Costs
3. Sourcing
4. Carbon Neutrality
Disadvantages
1. Long-Term Costs
2. Pollution and Water Use
03
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Sun
SUN as an energy source
The Sun is the star at the center of our solar system. It is mostly
hydrogen - about three quarters of its total mass - and helium about one quarter of its total mass. The source of the Sun’s energy is
nuclear fusion in the Sun and it is the main source of energy for
many of the energy sources.
04
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Examples
Examples
Fossil fuels such as oil, coal and gas are derived from
plants which grew requiring light from the Sun.
Sunlight is also needed by the plants used in biomass
energy production today.
Energy from the Sun drives the weather systems which
enable wind and hydroelectric power to be harnessed.
Solar energy is used directly in solar cells for electricity
generation.
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